Question

Find the missing value.Hint: Use the number line to find the missing value.4= -8--15-10-5051015

Answer 1

Notice that there are 12 units between -8 and 4:

In order to get 4 by adding or substracting a number from -8, we must add 12 units. Nevertheless, the sign that is set before the blank box is a negative sign. Remember that substracting a negative number is the same as adding its positive equivalent:

`4=-8+12=-8-(-12)`

Therefore, the answer is:

`-12`