Question
1
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Find the expression which has a sum nearly equal to 50.
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A
33 + 39
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B
38 + 68
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C
27 + 24
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D
28 + 69
The correct answer is "27 + 24".
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 + 39 = ?
↓ ↓
30 + 40 = 70
This expression has a sum nearly equal to 70.
At Option B:
38 + 68 = ?
↓ ↓
40 + 70 = 110
This expression has a sum nearly equal to 110.
At option C:
27 + 24 = ?
↓ ↓
30 + 20 = 50
This expression has a sum nearly equal to 50.
At the last option D:
28 + 69 = ?
↓ ↓
30 + 70 = 100
This expression has a sum nearly equal to 100.
So, the desired answer is "27 + 24".