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Find the expression which has a sum nearly equal to 50.

  • A

    33 + 39

  • B

    38 + 68

  • C

    27 + 24 

  • 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".