Topics
Roman Numerals
Number Work
Addition and Subtraction
Multiplication and Division
Fractions
- Types of Fractions
- Concept of Equivalent Fractions
- Like and Unlike Fraction
- Concept of Mixed Fractions
- Concept of Proper and Improper Fractions
- Conversion between Improper and Mixed fraction
- Conversion between Unlike and Like Fractions
- Comparing Fractions
- Addition of Fraction
- Subtraction of Fraction
- Multiplication of Fraction
- Using Operator 'Of' with Multiplication and Division
Angles
Circles
Multiples and Factors
Decimal Fractions
Measuring Time
Problems on Measurement
Perimeter and Area
Three Dimensional Objects and Nets
Pictographs
Patterns
Preparation for Algebra
- Introduction
- Reading and writing seven-digit numbers
Introduction
If we add 1 to the greatest 6-digit number, we get the smallest 7-digit number. It is called the ten lakh.
Greatest 6-digit number + 1 = Smallest 7-digit number (i.e., ten lakh).
9,99,999+1 =10,00,000
or
We multiply 1,00,000 by 10. That means we write one zero after the number to be multiplied.
1,00,000 × 10 = 10,00,000
This becomes a seven-digit number. We read it as ‘ten lakh’. We must make one more place for the 10 lakhs to the left of the lakhs place. In Western countries, the term million is used. One million is equal to ten lakhs.
Thus, ten lakh = 10,00,000.
Pattern:
9 + 1 = 10.
99 + 1 = 100.
999 + 1 = 1000.
9,999 + 1 = 10,000.
99,999 + 1 =1,00,000.
9,99,999 + 1 = 10,00,000.
99,99,999 + 1 = 1,00,00,000.
Reading and Writing seven-digit numbers
Reading Seven-Digit Numbers:
We read 18,35,614 as "eighteen lakh thirty-five thousand six hundred and fourteen." Just as we read ten thousand and thousands together, we similarly read ten lakhs and lakhs together.
Writing Seven-Digit Numbers:
- 31,25,745: thirty-one lakh, twenty-five thousand, seven hundred and forty-five.
- 88,00,400: eighty-eight lakh, four hundred
