Question
1
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Find the expression which has a sum nearly equal to 40.
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A
33 + 48
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B
24 + 23
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C
52 + 88
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D
19 + 79
The correct answer is "24 + 23".
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.
33 + 48 = ?
↓ ↓
30 + 50 = 80
This expression has a sum nearly equal to 80.
At Option B:
24 + 23 = ?
↓ ↓
20 + 20 = 40
This expression has a sum nearly equal to 40.
At option C:
52 + 88 = ?
↓ ↓
50 + 90 = 140
This expression has a sum nearly equal to 140.
At the last option D:
19 + 79 = ?
↓ ↓
20 + 80 = 100
This expression has a sum nearly equal to 100.
So, the desired answer is "24 + 23".