4
Question
What is the length of a 100 rupee note? Guess. Now measure it using a scale.
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
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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Solution
My guess:
Length of notebook = 25 cm
Breadth of notebook = 20 cm
Measure:
Length of notebook = 22.3 cm
Breadth of notebook = 18.3 cm
Difference in length between my guess and measure = 25 − 22.3
= 2.7 cm
Difference in breadth between my guess and measure = 20 − 18.3
= 1.7 cm
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
20
15
12
10
12
25
10
7
6
5
7
20
15.8
13.7
14.7
11.7
10.5
24
7.3
6.3
6.3
6.4
6.5
18
Length of notebook = 25 cm
Breadth of notebook = 20 cm
Measure:
Length of notebook = 22.3 cm
Breadth of notebook = 18.3 cm
Difference in length between my guess and measure = 25 − 22.3
= 2.7 cm
Difference in breadth between my guess and measure = 20 − 18.3
= 1.7 cm
|
Size of |
Your guess in cm |
Your measure in cm |
||
|
|
length |
width |
length |
width |
|
100 Rupee note |
20 |
10 |
15.8 |
7.3 |
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