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Have you seen frogs? Where? How many different types of frogs have you seen? Are all the frogs of the same length? Here are two interesting examples.

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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 |
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| Pencil of length about 7 cm |
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| A glass 11 cm high with water up to 5 cm |
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| A bangle of perimeter 20 cm |
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| A curly hair of length 16 cm |
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Which line is longer? C or D? Measure each line. How good is your guess?

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Guess whose tail is the longest. Now measure the tails. How good is your guess?






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

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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 | ||||
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Difference in size 
Do this for yourself and find the difference.
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What is Dinesh’s height in metres? _____ m _____ cm.
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Parth and Gini bought aam papad (dried mango slice) from a shop. Their pieces looked like these. Both could not make out whose piece was bigger.


- Suggest some ways to find out whose piece is bigger. Discuss
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Altogether how many squares can be arranged on it?
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So the area of piece A = ________ square cm
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In the same way, find the area of piece B.
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Who had the bigger piece? How much bigger?
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This stamp has an area of 4 square cm. Guess how many such stamps will cover this big rectangle.

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Measure the yellow rectangle. It is ________ cm long.
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How many stamps can be placed along its length?
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How wide is the rectangle? ________ cm
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How many stamps are needed to cover the rectangle?
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How close was your earlier guess? Discuss.
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What is the area of the rectangle? ________ square cm
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