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Integer Subtraction with Algebra Tiles

Learn how to subtract integers using algebra tiles. Change subtraction to addition, keeping the first number unchanged. Apply integer addition rules after transforming the problem. Practice solving subtraction problems with examples and word problems.

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Integer Subtraction with Algebra Tiles

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  1. Day 4 – Subtracting Integers

  2. How to subtract integers with algebra tiles • Change the problem to addition • Keep the first number the same • Change the problem from subtraction to addition • Make the last number its opposite • 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

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

  4. You try & change these problems Now follow adding rules or use algebra tiles to solve! Changed Problems -4 + -8 = 9 + -17 = 3 + 5 = 6 + -10 = -8 + 17 = • -4 – 8 = • 9 – 17 = • 3 - -5 = • 6 – 10 = • -8 - - 17 = -12 -8 8 -4 9

  5. Solve these practice problems! • -5 - -4 = • 4 - -7 = • -12 – 4 = • 9 - -5 = • -5 - -9 = • -10 – 8 = • -4 - -4 = • -12 -3 = • -1 • 11 • -16 • 14 • 4 • -18 • 0 • -15

  6. Word Problems • 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 • The temperature at 8pm was 6°F. At 2am the temperature decreased 13 degrees. What was the temperature at 2am? • 6 – 13 = -7°F

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