0

# How do you add two integers if they have different signs?

Updated: 10/10/2023

Wiki User

6y ago

If asked to add 8 and -2, we would start by moving eight units to the right of zero. Then we would move two units left from there because negative numbers make us move to the left side of the number line since our last positive is six units to the right of zero, the answer is 6
with negatives its basically going backwards, for example, (-2)+ 17=15 just go backwards.

Wiki User

6y ago

Wiki User

8y ago

If asked to add 8 and -2 (example) , we would start by moving eight units to the right of zero. Then we would move two units left from there because negative numbers make us move to the left side of the number line since our last positive is six units to the right of zero, the answer is 6

Wiki User

8y ago

If the integers have the same sign, add the numbers (ignoring the signs*) together and then keep the sign.

Examples:

4 + 5 = 9

-3 + -8 = -(3 + 8) = -11

If the integers have different signs, ignoring the signs* subtract the smaller from the larger and keep the sign of the larger.

Examples:

-3 + 10 → 10 - 3 = 7

5 + -11 → -(11 - 5) = -6

*Ignoring he signs of the numbers is taking the absolute value of the numbers.

Wiki User

8y ago

Add the unsigned numbers.Give them answer the same sign as the original integers.

For example

Both positive, eg 3 and 5 : 3 + 5 = 8 and so answer = 8

Both negative, eg -2 and -7 : 2 + 7 = 9 and so answer = -9.

Wiki User

6y ago

Subtract the number with the smaller absolute value from the other. Give the answer the sign of the number with the larger absolute value.