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What is the length of a 100 rupee note? Guess. Now measure it using a scale.

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प्रश्न

What is the length of a 100 rupee note? Guess. Now measure it using a scale.

एका वाक्यात उत्तर
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उत्तर

I guess that the 100 rupee note is 16 cm long. On measuring we find that the length of 100 rupee note is 15.6 cm.

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पाठ 10: Tenths and Hundredths - Tenths and Hundredths [पृष्ठ १३८]

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एनसीईआरटी Math - Magic [English] Class 5
पाठ 10 Tenths and Hundredths
Tenths and Hundredths | Q 6.1 | पृष्ठ १३८

संबंधित प्रश्‍न

When the planet Jupiter is at a distance of 824.7 million kilometres from the Earth, its angular diameter is measured to be 35.72″ of arc. Calculate the diameter of Jupiter


Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):-

the number of air molecules in your classroom.


500 gm = ______ kilogram.


A hand span is a reliable measure of length.


Guess the lengths to draw these things. Ask your friend to draw the same. After you make the drawing use a scale to measure the length. Whose drawing showed a better guess?

Guess its length
and draw
Measure of
your drawing
Measure of your
friend’s drawing
An ant of length
less than 1 cm
   
Pencil of length
about 7 cm
   
A glass 11 cm high with
water up to 5 cm
   
A bangle of perimeter
20 cm
   
A curly hair of length
16 cm
   

Which line is longer? C or D? Measure each line. How good is your guess?


Now guess the length and width of many other things. Measure and find the difference between your measure and your guess.

Size of Your guess in cm Your measure in cm
  Length Width Length Width
100 Rupee note        
10 Rupee note        
20 Rupee note        
5 Rupee note        
Post card        
Math-Magic book        

What is Dinesh’s height in metres? _____ m _____ cm.


How wide is the rectangle? ________ cm


You can play this game on the ground. Make two squares of one square meter each. Divide your class into two teams. Ready to play!

  • Which team could make more children stand in their square? How many?

You can play this game on the ground. Make two squares of one square meter each. Divide your class into two teams. Ready to play!

  • Which team could make more children sit in their square? How many?

Chumki, Jhumri, and Imran need wire to make a fence.

  • How much wire in all will the three need?

Give some examples of larger length measures.


What is the unit of measurements of very small lengths?


Length is ______.


The Unit used to measure length ______.


  1. The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
  2. Moon is seen to be of (½)°diameter from the earth. What must be the relative size compared to the earth?
  3. From parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth diameters.

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