Add & Subtract Integers

What is an integer?

• A whole number

• Whole numbers and their opposites

• Any rational number

• A fraction written as a decimal

When adding numbers with the same sign...

• Add the numbers, keep the sign

• Subtract the numbers, keep the sign of the larger number

• Subtract the numbers, keep the sign

• Add the numbers, keep the sign of the larger number

When adding numbers with different signs...

• Add the numbers, keep the sign

• Subtract the numbers, keep the sign of the larger number

• Subtract the numbers, keep the sign

• Add the numbers, keep the sign of the larger number

12 + (-15)

Answer explanation

When adding integers with DIFFERENT signs; subtract the numbers and keep the sign of the larger number

-8 - (-6)

Answer explanation

When you are subtracting a negative and your minus sign and negative are next to each other, they come together to make a plus sign! -8 - (-6) becomes -8 + 6

5 - (-9)

Answer explanation

When you are subtracting a negative and your minus sign and negative are next to each other, they come together to make a plus sign! 5 - (-9) becomes 5 + 9

-10 + -6

3 + -15

Answer explanation

When adding integers with DIFFERENT signs; subtract the numbers and keep the sign of the larger number

-12 - (-14)

-11 - 7