Question
1
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Find the expression which has a sum nearly equal to 60.

A
28 + 48

B
49 + 19

C
17 + 37

D
64 + 52
The correct answer is "17 + 37".
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 + 48 = ?
↓ ↓
30 + 50 = 80
This expression has a sum nearly equal to 80.
At Option B:
49 + 19 = ?
↓ ↓
50 + 20 = 70
This expression has a sum nearly equal to 70.
At option C:
17 + 37 = ?
↓ ↓
20 + 40 = 60
This expression has a sum nearly equal to 60.
At the last option D:
64 + 52 = ?
↓ ↓
60 + 50 = 110
This expression has a sum nearly equal to 110.
So, the desired answer is "17 + 37".