Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 7th

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide chapter 1 - Number System [Latest edition]

Chapter 1: Number System

Exercise 1.1Exercise 1.2Exercise 1.3Exercise 1.4Exercise 1.5
Exercise 1.1 [Pages 8 - 9]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide Chapter 1 Number SystemExercise 1.1 [Pages 8 - 9]

Exercise 1.1 | Q 1. (i) | Page 8

Write the decimal numbers for the following pictorial representation of numbers

Exercise 1.1 | Q 1. (ii) | Page 8

Write the decimal numbers for the following pictorial representation of numbers

Exercise 1.1 | Q 2. (i) | Page 8

Express the following in cm using decimal

5 mm

Exercise 1.1 | Q 2. (ii) | Page 8

Express the following in cm using decimal

9 mm

Exercise 1.1 | Q 2. (iii) | Page 8

Express the following in cm using decimal

42 mm

Exercise 1.1 | Q 2. (iv) | Page 8

Express the following in cm using decimal

8 cm 9 mm

Exercise 1.1 | Q 2. (v) | Page 8

Express the following in cm using decimal

375 mm

Exercise 1.1 | Q 3. (i) | Page 8

Express the following in metres using decimal

16 cm

Exercise 1.1 | Q 3. (ii) | Page 8

Express the following in metres using decimal

7 cm

Exercise 1.1 | Q 3. (iii) | Page 8

Express the following in metres using decimal

43 cm

Exercise 1.1 | Q 3. (iv) | Page 8

Express the following in metres using decimal

6 m 6 cm

Exercise 1.1 | Q 3. (v) | Page 8

Express the following in metres using decimal

2 mm 54 cm

Exercise 1.1 | Q 4. (i) | Page 8

Expand the following decimal numbers

37.3

Exercise 1.1 | Q 4. (ii) | Page 8

Expand the following decimal numbers

658.37

Exercise 1.1 | Q 4. (iii) | Page 8

Expand the following decimal numbers

237.6

Exercise 1.1 | Q 4. (iv) | Page 8

Expand the following decimal numbers

5678.358

Exercise 1.1 | Q 5. (i) | Page 8

Express the following decimal numbers in place value grid and write the place value of the underlined digit

53.61

Exercise 1.1 | Q 5. (ii) | Page 8

Express the following decimal numbers in place value grid and write the place value of the underlined digit

263.271

Exercise 1.1 | Q 5. (iii) | Page 8

Express the following decimal numbers in place value grid and write the place value of the underlined digit

17.39

Exercise 1.1 | Q 5. (iv) | Page 8

Express the following decimal numbers in place value grid and write the place value of the underlined digit

9.657

Exercise 1.1 | Q 5. (v) | Page 8

Express the following decimal numbers in place value grid and write the place value of the underlined digit

4972.068

Objective type questions

Exercise 1.1 | Q 6 | Page 8

The place value of 3 in 85.073 is ________

• tenths

• hundredths

• thousands

• thousandths

Exercise 1.1 | Q 7 | Page 8

To convert grams into kilograms, we have to divide it by

• 10000

• 1000

• 100

• 10

Exercise 1.1 | Q 8 | Page 9

The decimal representation of 30 kg and 43 g is ______ kg

• 30.43

• 30.430

• 30.043

• 30.0043

Exercise 1.1 | Q 9 | Page 9

A cricket pitch is about 264 cm wide. It is equal to ______ m.

• 26.4

• 2.64

• 0.264

• 0.0264

Exercise 1.2 [Pages 13 - 14]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide Chapter 1 Number SystemExercise 1.2 [Pages 13 - 14]

Exercise 1.2 | Q 1 | Page 13

Fill in the following place value table.

 S.No. Decimal form Hundreds (100) Tens (10) Ones (1) Tenths (1/10) Hundredths (1/100) Thousandths (1/1000) 1. 320.157 3 ___ 0 1 5 7 2. 103.709 1 0 3 ___ 0 9 3. 4.003 0 0 4 0 ___ ___ 4. 360.805 3 ___ ___ 8 0 ___
Exercise 1.2 | Q 2 | Page 14

Write the decimal numbers from the following place value table.

 S.No. Hundreds (100) Tens (10) Ones (1) Tenths (1/10) Hundredths (1/100) Thousandths (1/1000) Decimal form 1. 8 0 1 5 6 2 ____ 2. 9 3 2 0 5 6 ____ 3. 0 4 7 5 0 9 ____ 4. 5 0 3 0 0 7 ____ 5. 6 8 0 3 1 0 ____ 6. 1 0 9 9 0 8 ____
Exercise 1.2 | Q 3. (i) | Page 14

Write the following decimal numbers in the place value table

25.178

Exercise 1.2 | Q 3. (ii) | Page 14

Write the following decimal numbers in the place value table

0.025

Exercise 1.2 | Q 3. (iii) | Page 14

Write the following decimal numbers in the place value table

428.001

Exercise 1.2 | Q 3. (iv) | Page 14

Write the following decimal numbers in the place value table

173.178

Exercise 1.2 | Q 3. (v) | Page 14

Write the following decimal numbers in the place value table

19.54

Exercise 1.2 | Q 4. (i) | Page 14

Write the following as decimal numbers

20 + 1 + 2/10 + 3/100 + 7/1000

Exercise 1.2 | Q 4. (ii) | Page 14

Write the following as decimal numbers

3 + 8/10 + 4/100 + 5/1000

Exercise 1.2 | Q 4. (iii) | Page 14

Write the following as decimal numbers

6 + 0/10 + 0/100 + 9/1000

Exercise 1.2 | Q 4. (iv) | Page 14

Write the following as decimal numbers

900 + 50 + 6 + 3/100

Exercise 1.2 | Q 4. (v) | Page 14

Write the following as decimal numbers

6/10 + 3/100 + 1/1000

Exercise 1.2 | Q 5. (i) | Page 14

Convert the following fractions into decimal numbers

3/10

Exercise 1.2 | Q 5. (ii) | Page 14

Convert the following fractions into decimal numbers

3 1/2

Exercise 1.2 | Q 5. (iii) | Page 14

Convert the following fractions into decimal numbers

3 3/5

Exercise 1.2 | Q 5. (iv) | Page 14

Convert the following fractions into decimal numbers

3/2

Exercise 1.2 | Q 5. (v) | Page 14

Convert the following fractions into decimal numbers

4/5

Exercise 1.2 | Q 5. (vi) | Page 14

Convert the following fractions into decimal numbers

99/100

Exercise 1.2 | Q 5. (vii) | Page 14

Convert the following fractions into decimal numbers

3 19/25

Exercise 1.2 | Q 6. (i) | Page 14

Write the following decimals as fractions

2.5

Exercise 1.2 | Q 6. (ii) | Page 14

Write the following decimals as fractions

6.4

Exercise 1.2 | Q 6. (iii) | Page 14

Write the following decimals as fractions

0.75

Exercise 1.2 | Q 7. (i) | Page 14

Express the following decimals as fractions in lowest form

2.34

Exercise 1.2 | Q 7. (ii) | Page 14

Express the following decimals as fractions in lowest form

0.18

Exercise 1.2 | Q 7. (iii) | Page 14

Express the following decimals as fractions in lowest form

3.56

Objective type questions

Exercise 1.2 | Q 8 | Page 14

3 + 4/100 + 9/1000 = ?

• 30.49

• 3049

• 3.0049

• 3.049

Exercise 1.2 | Q 9 | Page 14

3/5 = _________

• 0.06

• 0.006

• 6

• 0.6

Exercise 1.2 | Q 10 | Page 14

The simplest form of 0.35 is

• 35/1000

• 35/10

• 7/20

• 7/100

Exercise 1.3 [Pages 16 - 17]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide Chapter 1 Number SystemExercise 1.3 [Pages 16 - 17]

Exercise 1.3 | Q 1. (i) | Page 16

Compare the following decimal numbers and find out the smaller number

2.08, 2.086

Exercise 1.3 | Q 1. (ii) | Page 16

Compare the following decimal numbers and find out the smaller number

0.99, 1.9

Exercise 1.3 | Q 1. (iii) | Page 16

Compare the following decimal numbers and find out the smaller number

3.53, 3.35

Exercise 1.3 | Q 1. (iv) | Page 16

Compare the following decimal numbers and find out the smaller number

5.05, 5.50

Exercise 1.3 | Q 1. (v) | Page 16

Compare the following decimal numbers and find out the smaller number

123.5, 12.35

Exercise 1.3 | Q 2. (i) | Page 17

Arrange the following in ascending order

2.35, 2.53, 5.32, 3.52, 3.25

Exercise 1.3 | Q 2. (ii) | Page 17

Arrange the following in ascending order

123.45, 123.54, 125.43, 125.34, 125.3

Exercise 1.3 | Q 3. (i) | Page 17

Compare the following decimal numbers and find the greater number

24.5, 20.32

Exercise 1.3 | Q 3. (ii) | Page 17

Compare the following decimal numbers and find the greater number

6.95, 6.59

Exercise 1.3 | Q 3. (iii) | Page 17

Compare the following decimal numbers and find the greater number

17.3, 17.8

Exercise 1.3 | Q 3. (iv) | Page 17

Compare the following decimal numbers and find the greater number

235.42, 235.48

Exercise 1.3 | Q 3. (v) | Page 17

Compare the following decimal numbers and find the greater number

0.007, 0.07

Exercise 1.3 | Q 3. (vi) | Page 17

Compare the following decimal numbers and find the greater number

4.571, 4.578

Exercise 1.3 | Q 4. (i) | Page 17

Arrange the given decimal numbers in descending order

17.35, 71.53, 51.73, 73.51, 37.51

Exercise 1.3 | Q 4. (ii) | Page 17

Arrange the given decimal numbers in descending order

456.73, 546.37, 563.47, 745.63, 457.71

Objective type questions

Exercise 1.3 | Q 5 | Page 17

0.009 is equal to

• 0.90

• 0.090

• 0.00900

• 0.900

Exercise 1.3 | Q 6 | Page 17

37.70 square 37.7

• =

• <

• >

Exercise 1.3 | Q 7 | Page 17

78.56 square 78.57

• <

• >

Exercise 1.4 [Page 18]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide Chapter 1 Number SystemExercise 1.4 [Page 18]

Exercise 1.4 | Q 1 | Page 18

Write the decimal numbers represented by the points P, Q, R and S on the given number line

Exercise 1.4 | Q 2. (i) | Page 18

Represent the following decimal numbers on the number line

1.7

Exercise 1.4 | Q 2. (ii) | Page 18

Represent the following decimal numbers on the number line

0.3

Exercise 1.4 | Q 2. (iii) | Page 18

Represent the following decimal numbers on the number line

2.1

Exercise 1.4 | Q 3. (i) | Page 18

Between which two whole numbers, the following decimal number lies?

3.3

Exercise 1.4 | Q 3. (ii) | Page 18

Between which two whole numbers, the following decimal number lies?

2.5

Exercise 1.4 | Q 3. (iii) | Page 18

Between which two whole numbers, the following decimal number lies?

0.9

Exercise 1.4 | Q 4. (i) | Page 18

Find the greater decimal number in the following.

2.3, 3.2

Exercise 1.4 | Q 4. (ii) | Page 18

Find the greater decimal number in the following.

5.6, 6.5

Exercise 1.4 | Q 4. (iii) | Page 18

Find the greater decimal number in the following.

1.2, 2.1

Exercise 1.4 | Q 5. (i) | Page 18

Find the smaller decimal number in the following.

25.3, 25.03

Exercise 1.4 | Q 5. (ii) | Page 18

Find the smaller decimal number in the following.

7.01, 7.3

Exercise 1.4 | Q 5. (iii) | Page 18

Find the smaller decimal number in the following.

5.6, 6.05

Objective type questions

Exercise 1.4 | Q 6 | Page 18

Between which two whole numbers 1.7 lie?

• 2 and 3

• 3 and 4

• 1 and 2

• 1 and 7

Exercise 1.4 | Q 7 | Page 18

The decimal number which lies between 4 and 5 is ______

• 4.5

• 2.9

• 1.9

• 3.5

Exercise 1.5 [Pages 18 - 19]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide Chapter 1 Number SystemExercise 1.5 [Pages 18 - 19]

Miscellaneous Practice problems

Exercise 1.5 | Q 1. (i) | Page 18

Write the following decimal numbers in the place value table

247.36

Exercise 1.5 | Q 1. (ii) | Page 18

Write the following decimal numbers in the place value table

132.105

Exercise 1.5 | Q 2. (i) | Page 18

Write the following as decimal number.

300 + 5 + 7/10 + 9/100 + 2/100

Exercise 1.5 | Q 2. (ii) | Page 18

Write the following as decimal number.

1000 + 400 + 30 + 2 + 6/10 + 7/100

Exercise 1.5 | Q 3. (i) | Page 19

Which is greater?

0.888 or 0.28

Exercise 1.5 | Q 3. (ii) | Page 19

Which is greater?

23.914 or 23.915

Exercise 1.5 | Q 4 | Page 19

In a 25 m swimming competition, the time taken by 5 swimmers A, B, C, D and E are 15.7 seconds, 15.68 seconds, 15.6 seconds, 15.74 seconds and 15.67 seconds respectively. Identify the winner

Exercise 1.5 | Q 5. (i) | Page 19

Convert the following decimal numbers into fractions

23.4

Exercise 1.5 | Q 5. (ii) | Page 19

Convert the following decimal numbers into fractions

46.301

Exercise 1.5 | Q 6. (i) | Page 19

Express the following in kilometres using decimal

256 m

Exercise 1.5 | Q 6. (ii) | Page 19

Express the following in kilometres using decimal

4567 m

Exercise 1.5 | Q 7 | Page 19

There are 26 boys and 24 girls in a class. Express the fraction of boys and girls as decimal numbers

Challenge Problems

Exercise 1.5 | Q 8. (i) | Page 19

Write the following amount using decimal

809 rupees 99 paise

Exercise 1.5 | Q 8. (ii) | Page 19

Write the following amount using decimal

147 rupees 70 paise

Exercise 1.5 | Q 9. (i) | Page 19

Express the following in metres using decimal

1328 cm

Exercise 1.5 | Q 9. (ii) | Page 19

Express the following in metres using decimal

419 cm

Exercise 1.5 | Q 10. (i) | Page 19

Express the following using decimal notation

8 m 30 cm in metres

Exercise 1.5 | Q 10. (ii) | Page 19

Express the following using decimal notation

24 km 200 m in kilometres

Exercise 1.5 | Q 11. (i) | Page 19

Write the following fractions as decimal number

23/10000

Exercise 1.5 | Q 11. (ii) | Page 19

Write the following fractions as decimal number

421/100

Exercise 1.5 | Q 11. (iii) | Page 19

Write the following fractions as decimal number

37/10

Exercise 1.5 | Q 12. (i) | Page 19

Convert the following decimals into fractions and reduce them to the lowest form

2.125

Exercise 1.5 | Q 12. (ii) | Page 19

Convert the following decimals into fractions and reduce them to the lowest form

0.0005

Exercise 1.5 | Q 13 | Page 19

Represent the decimal numbers 0.07 and 0.7 on a number line

Exercise 1.5 | Q 14. (i) | Page 19

Write the following decimal numbers in words

4.9

Exercise 1.5 | Q 14. (ii) | Page 19

Write the following decimal numbers in words

220.0

Exercise 1.5 | Q 14. (iii) | Page 19

Write the following decimal numbers in words

0.7

Exercise 1.5 | Q 14. (iv) | Page 19

Write the following decimal numbers in words

86.3

Exercise 1.5 | Q 15. (i) | Page 19

Between which two whole numbers the given number lies?

0.2

Exercise 1.5 | Q 15. (ii) | Page 19

Between which two whole numbers the given number lies?

3.4

Exercise 1.5 | Q 15. (iii) | Page 19

Between which two whole numbers the given number lies?

3.9

Exercise 1.5 | Q 15. (iv) | Page 19

Between which two whole numbers the given number lies?

2.7

Exercise 1.5 | Q 15. (v) | Page 19

Between which two whole numbers the given number lies?

1.7

Exercise 1.5 | Q 15. (vi) | Page 19

Between which two whole numbers the given number lies?

1.3

Exercise 1.5 | Q 16 | Page 19

By how much is 9/10 km less than 1 km. Express the same in decimal form

Chapter 1: Number System

Exercise 1.1Exercise 1.2Exercise 1.3Exercise 1.4Exercise 1.5

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Mathematics Term 2 Answers Guide chapter 1 - Number System

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Concepts covered in Class 7th Mathematics Term 2 Answers Guide chapter 1 Number System are Concept of Decimal Numbers, Concept of Tenths, Hundredths and Thousandths in Decimal, Place Value in the Context of Decimal Fraction., Interconversion of Fraction and Decimal, Comparing Decimal Numbers, Representing Decimals on the Number Line.

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