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Which subtraction model-take-away, missing addend, comparison, or measurement-corresponds best to each problem below? (a) Kramer has a book of 10 pizza coupons. If he used 6 coupons to buy' pizza for Friday's party, how many coupons does he have left? (b) Tobias has saved \( \$ 35 \) toward the \( \$ 45 \mathrm{CD} \) player he wants to buy. How much money does he have to add to his savings to purchase the player? (a) Which subtraction model corresponds best to this problem? Take-away Measurement Which subtraction model corresponds best to this problem? Take-away Comparison

Ask by Turnbull Zimmerman. in the United States
Mar 17,2025

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- (a) Take-away - (b) Missing addend

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The Deep Dive

In problem (a), we see Kramer starting with 10 pizza coupons and using 6, leaving him with 4. This is a classic take-away model where items are removed from a total, making it easy to visualize the subtraction as simply taking away what's been used! In problem (b), Tobias has a specific goal in mind—the cost of the CD player. He knows he needs $45 but only has $35, which prompts him to think: how much more does he need? This fits the missing addend model perfectly, as he is looking for the additional amount required to reach his target amount!

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