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Find the expression which has a sum nearly equal to 40.

  • A

    33 + 48

  • B

    24 + 23 

  • C

    52 + 88

  • 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".