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hey. im a 7th grader, i need help with my homework. the question says, what are the missing operations?a. 48 ? (-8) = (-6)b. (-40) ? 8 = (-5)c. 12 ? (-2) = 14d. 18 ? (-12) = 6e. 18 ? (-20) = -2 f. 22 ? (-0.5) = -11

User Fadd
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1 Answer

18 votes
18 votes

Hello!

a. 48 ? (-8) = (-6) - division

To solve this exercise, let's think from right to left:

What operation between (-6) and (-8) results in 48?

When we do (-6) * (-8) we obtain 48, right?

As we are doing it in reverse, the opposite operation will be division, look:

48 ÷ (-8) = -6

b. (-40) ? 8 = (-5) - division

Let's solve it in a similar way: what operation between (-5) and 8 results in 40?

(-5) * 8 = -40

So, (-40) divided by 8 = (-5)

c. 12 ? (-2) = 14 - subtraction

This will be a bit different:

Notice that the difference between these numbers is the middle number. So, let's try another operation now:

12 - (-2) = 14

Attention here: the - sign will invert the value of what is inside the parentheses.

d. 18 ? (-12) = 6 - addition

This is a addition, look:

18 + (-12) = 6

18 - 12 = 6

e. 18 ? (-20) = -2 - addition

Here we have another addition between these numbers:

18 + (-20) = -2

18 - 20 = -2

f. 22 ? (-0.5) = -11 - multiplication

Here, (-0.5) is the same as (-1/2).

When we multiply something by 1/2, the result is half.

So:

22 * (-0.5) = 11

User Ehsan Foroughi
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