Question

Which is another way to check the sum of 52 + 23 + 10 + 78?

A. 78 + 10 + 23 + 52
B. 78 – 52 – 10 – 23
C. 163 – 52 + 23 + 10 + 78
D. 78 – 52 + 10 + 23

Answer 1

First, you would do the math.
52 + 23 + 10 + 78 = 163

Now, using the process of elimination and common sense, we can narrow down the answer to A. All you have to do is check it.
78 + 10 + 23 + 52 = 163

So, 78 + 10 + 23 + 52 = 52 + 23 + 10 + 78

Your answer would be A. 78 + 10 + 23 + 52

Answer 2

A. 78 + 10 + 23 + 52

Explanation:

We can solve the problem by using the commutative property: "in an addition, changing the order of the operands does not change the result.

The original addition is 52 + 23 + 10 + 78. We see that option A is exactly the same addition, only the order of the numbers has been changed:

78 + 10 + 23 + 52

Therefore, the two additions are equivalent.