Question

Which equation shows the correct grouping symbols? A. (5 + 70) ÷ 5 × 2 = 30 B. 5 + 70 ÷ 5 × 2 = 30 C. 5 + (70 ÷ 5) × 2 = 30 D. 5 + 70 ÷ (5 × 2) = 30 A. B. C. D.

Answer 1

Answer:

equation A

Step-by-step explanation:

To know what equation is correct, we can calculate the left part of each one, and checking if the value matches the right part (which is always 30)

(Remember: to calculate equations, we first solve operations inside parenthesis, then divisions and multiplications, and for last sums and subtractions)

So, in option A, we have in the left part:

(5 + 70) ÷ 5 × 2 -> 75 ÷ 5 × 2 -> 15 × 2 -> 30

This option is correct, as the left part matches the right part.

Checking the other options, we have for option B:

5 + 70 ÷ 5 × 2 -> 5 + 14 × 2 -> 5 + 28 -> 33

It does not match the left part. For option C:

5 + (70 ÷ 5) × 2 -> 5 + 14 × 2 -> 5 + 28 -> 33

It does not match the left part. For option D:

5 + 70 ÷ (5 × 2) -> 5 + 70 ÷ 10 -> 5 + 7 -> 12

It does not match the left part. So, the correct answer is equation A