Multiplication and Division of Signed Mumbers: Complete the missing numbers

Let's pay attention to the exercise on the left side in terms of plus and minus signs.

The exercise looks like this:

$?:+:+=$

If we solve the equation from left to right, we can see that we first divide a number by a positive number:

$?:+=$

If we use a positive number, we'll get a positive number, and then in the next exercise, dividing a positive number by a positive number would result in a number greater than zero.

Therefore, we need to divide a negative number by a positive number in order to get a negative number.

Therefore:

$-:+=-$

$-:+=-$

$- < 0$

Therefore the answer is $-98$

Let's pay attention to the exercise on the left side observing in particular the plus and minus signs.

The exercise looks like this:

$+:\text{?:}+=$

If we solve the equation from left to right, we observe that we first divide a positive number by an unidentified integer:

$+:\text{?}$

Since the next operation is also division by a positive number, we need a negative number in order for the result to be less than 0:

$+:-:+=$

$-:+=-$

$- < 0$

Therefore the answer is $-40$

Let's begin by observing the exercise on the left side whilst paying particular attention to the plus and minus signs.

The exercise looks like this:

$-:\text{?:}+=$

If we solve the equation from left to right, we can observe that we first divide a negative number by an unidentified integer:

$-:\text{?}$

Our result needs to be greater than zero, therefore our first operation must give us a positive number, so that in the final operation the resulting number will be positive.

Therefore:

$-:-:+=$

$+:+=+$

$+ > 0$

Therefore the answer is $-\frac{1}{4}$