Question

p.
Round off the following numbers to the nearest 10.
73
f. 234
k. 8,354
b. 96
9 791
i. 5,161
28
h. 552
m. 50,217
d.65
i. 2,532
n. 63,482
e. 101
j. 6.103
0.
25,000
72,093
3.27.816
a.
I.
S.
4,56,763
4,51,760
6.34.179
t.​

Answer 1

Answer:

We will learn the basic knowledge for estimating a sum. Here we will learn an easy way to estimate a sum of two numbers by rounding.

In case of two digit numbers we can only round the number to the nearest tens place i.e. only one place estimate.

For example, let us estimate the following sums:

(i) 47 + 32

We need to round the number to the nearest 10.

47 → 50

32 → 30

50 + 30 = 80

(ii) 25 + 34

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Answer 2

Answer:

• If the digit at ones place is less than 5, replace ones digit by 0 ,
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0(i) 62 - 60
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0(i) 62 - 60(ii) 265 - 270
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0(i) 62 - 60(ii) 265 - 270(iii) 543 - 540
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0(i) 62 - 60(ii) 265 - 270(iii) 543 - 540(iv) 8261 - 8260
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0(i) 62 - 60(ii) 265 - 270(iii) 543 - 540(iv) 8261 - 8260(v) 6294 - 6290
• If the digit at ones place is less than 5, replace ones digit by 0 ,And keep the other digit as they are:And if the digit at ones place is 5 or more than 5, increase tens digit by 1 and replace ones digit by 0(i) 62 - 60(ii) 265 - 270(iii) 543 - 540(iv) 8261 - 8260(v) 6294 - 6290(vi) 3008 - 3010