Question

Ju Chan solved the previous question by finding the expression 4(-15).

Which addition problem would give the same result? Choose all that apply.
15 + 15 + 15 + 15
4 + 4 + 4 + 4
(–1)(15 + 15 + 15 + 15)
(–15) + (–15) + (–15) + (–15)

Answer 1

The answers are 3 and 4

Explanation:

Answer 2

(-1)(15+15+15+15)

(-15)+(-15)+(-15)+(-15)

Explanation:

1. The multiplication shown in the problem above is:

4(-15)

The product is -60

4(-15)=-60

2. The multiplication above could indicate that:

- The number -15 is added 4 times.

- The number 15 is added 4 times and then is multiplied by -1.

- The number -4 is added 15 times.

- The number 4 is added 15 times and then is multiplied by -1.

Keeping these on mind, you can conclude that the correct options are the third option and the last option:

(-1)(15+15+15+15)=(-1)(60)=-60

(-15)+(-15)+(-15)+(-15)=-15-15-15-15=-60