What is 15 minus negative 91?

Here we will not only give you the answer to 15 minus negative 91, but also explain how we got the answer.

Start by picturing a number line that goes to negative infinity on the left side of 0 and positive infinity on the right side of 0:

∞ ..... -3, -2, -1, 0, +1, +2, +3, .... ∞

Looking at the number line above, we can make the following observation:

Adding a positive number goes to the right.
Adding a negative number goes to the left.

Adding and subtracting cannot go in the same direction on a number line. Therefore, this must also be true:

Subtracting a positive number goes to the left.
Subtracting a negative number goes to the right.

Thus, with the problem 15 minus negative 91, we are subtracting a negative number and we go to the right. Specifically, we go from +15 to +106 on the number line.

Here is 15 minus negative 91 in mathematical terms with the answer:

15 - (-91) = 106

You may already know that minus minus equals plus or that 15 minus negative 91 is the same as 15 plus 91, but we hope that this page explained the underlying mathematical reason for the answer.

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