In this topic, students will:
use models to subtract tens
use a hundred chart to subtract a multiple of 10 from another 10
use an open number line to solve subtraction problems
use addition to subtract tens
use mental math to subtract ten from a two-digit number
use different strategies to subtract
Vocabulary:
No new vocabulary for this topic
At-home Practice:
Supplies:
a deck of cards (Remove all face cards)
Player 1 turns over two cards and calls the value of each card’s digit as if it were in the tens place. (ex. A 6 will have a value of 60.) Player 1 takes the higher value, subtracts the lower value, and calls out the difference. If correct, Player 1 keeps the cards. If not, return the cards to the pile. Player 2 plays in the same way, and the game continues until all cards have been won. The player with the most cards wins.
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Supplies:
a deck of cards (Remove all face cards)
Player 1 turns over two cards to make a two-digit number. Player 1 then calls out “Add!” or “Subtract!”, and Player 2 must add or subtract 10. If correct, Player 2 keeps the cards. If not, place the cards back in the pile. Trade roles and repeat until all cards have been won. The player with the most cards wins.