Question
1
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Find the expression which has a sum nearly equal to 90.
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A
28 + 88
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B
67 + 19
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C
69 + 47
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D
64 + 52
The correct answer is "67 + 19".
Solution:
To find the correct answer, we find the sum of each expression by rounding (up or down) the addends.
At Option A:
Round the addends to the nearest tens and then add.
28 + 88 = ?
↓ ↓
30 + 90 = 120
This expression has a sum nearly equal to 120.
At Option B:
67 + 19 = ?
↓ ↓
70 + 20 = 90
This expression has a sum nearly equal to 90.
At option C:
69 + 47 = ?
↓ ↓
70 + 50 = 120
This expression has a sum nearly equal to 120.
At the last option D:
64 + 52 = ?
↓ ↓
60 + 50 = 110
This expression has a sum nearly equal to 110.
So, the desired answer is "67 + 19".