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Find the expression which has a sum nearly equal to 90.

  • A

    28 + 88

  • B

    67 + 19 

  • C

    69 + 47

  • 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".