BIG IDEA #1 - BIG IDEA #2 - BIG IDEA #3
Sub Total / partial sumAn addition algorithm in which separate sums are added for each place value of the numbers and then those sums are added to get a final sum. EDM has taught this since 2nd grade.
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Regroup Above / column AdditionAn addition algorithm in which the addends' digits are first added in each place-value column separately, and then 10-for-1 trades are made until each column has only one digit.
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- Hoop Shoot: A competitive addition game with the red team vs. the blue team! Who will win?
- Fruit Splat: Shoot the right fruit to score the points! Can you get the high score? |
UNGROUP Above / Trade FirstA subtraction algorithm in which all necessary trades between places in the numbers are done before any subtractions are carried out. This lets you concentrate on one thing at a time.
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- Drag and Drop: Can you solve these subtraction puzzles and win the game?
- Fruit Splat: Shoot the right fruit to score the points! Can you get the high score? - Home Run: Can you score a grand slam home run using subtraction? |