Day 4 – Subtracting Integers. How to subtract integers with algebra tiles 1. Change the problem to addition  Keep the first number the same  Change.

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Presentation transcript:

Day 4 – Subtracting Integers

How to subtract integers with algebra tiles 1. Change the problem to addition  Keep the first number the same  Change the problem from subtraction to addition  Make the last number its opposite 2. Now follow adding integer rules  Same sign – add the numbers keep the sign  Different signs – subtract the numbers, keep the sign of the greater absolute value

Here’s how you change the problem! -8 – stays the same Subtraction becomes addition 7 changes to its opposite -7 *Then follow addition rules or use algebra tiles to solve Answer: -15

You try & change these problems – 8 = 2. 9 – 17 = = 4. 6 – 10 = = = = = = = Changed Problems Now follow adding rules or use algebra tiles to solve!

Solve these practice problems! = = – 4 = = = – 8 = = =

Word Problems 1. A submarine is situated at 450 feet below sea level and sinks 75 feet. What is the new position of the submarine?  -450 – 75 = -525 feet 2. The temperature at 8pm was 6°F. At 2am the temperature decreased 13 degrees. What was the temperature at 2am?  6 – 13 = -7°F