Estimate the following sum to the nearest ten
66+54
Answers
Step-by-step explanation:
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
We need to round the number to the nearest 10.
25 → 30
34 → 30
30 + 30 = 60
(iii) 75 + 13
We need to round the number to the nearest 10.
75 → 80
13 → 10
80 + 10 = 90
1. Estimate the sums of 72 and 48
Solution:
We round the number to the nearest 10.
72 → 70
48 → 50
So, 72 is nearest to 70 and 48 is nearest to 50
70 + 50 = 120
Thus the estimated sum = 120
2. Estimate the sums to the nearest ten and also find the actual sum of 87 and 79.
Solution:
We round the number to the nearest 10.
87 → 90
79 → 80
So, 87 is nearest to 90 and 79 is nearest to 80
90 + 80 = 170
Thus the estimated sum = 170
The actual sum of 87 and 79
87 + 79 = 166
Thus the actual sum = 166
Note: To estimate to the nearest 10, we see the digit/number at one’s place. It is converted to 0 or 10 as proper. If the digit/number is < 10/2, it is converted to zero and if it is > 10/2, it is converted to10.
In case of three digit numbers we can only round the number to the nearest tens place i.e. only one place estimate.
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