Help students get quicker at solving -8 and -9 subtraction basic facts by sharing this strategy with them. They shift the equation on the number line to make an easier equation that will have the same answer.
Step 1: Add to the 8 or 9 to make it a 10.
Step 2: Add the same amount to the other number.
Step 3: Solve the new subtraction sentence to get the answer to the original sentence.
It is designed for a small group format with a scaffolded practice sheet (example->do together->you try) and a quick bingo-style practice game.
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This product is designed to help with Common Core Standards 1.OA.C.6 and 2.OA.B.2.
2016 Lessons by Leah