Introductory Activity: Explore page 66...
Use what you know about solving addition problems with tiles to see if you can figure out the steps to solving subtraction equations. Solve the 4 equations on page 66 and sketch your tiles.
A. (+5) - (+3)
B. (+5) - (-3)
C. (-3) - (+5)
D. (-3) - (- 5)
What happens when you subtract a negative integer? (write a rule to help you remember this)
Steps to Using Tiles to subtract Integers.....
1. Use tiles to model the first integer.
2. Then make as many zero pairs as the number in the integer indicates. (ex: If the 2nd integer is (+9) make 9 zero pairs.)
2. Circle the tiles indicated by the 2nd integer and remove
with an arrow. (ex: Circle and remove all 9 positive tiles and leave all 9 negative tiles.)
3. The integer that is represented by the remaining tiles is the answer to the subtraction equation.
Example: (-7) - (+5)
Let's solve these examples: Remember to follow the steps!
Hint: Use these tiles on the right side to solve the second problem!
Think, Pair, Share for Practice - Complete the 2 questions at the bottom of
Page 68 using Tiles.
Compare your results to a Partner's.
Homework:
Complete Practice page 69....1-11
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