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

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UpStudy AI · Accepted Answer

To determine which subtraction model corresponds best to each problem, let's analyze them one by one.

### Problem (a)
**Statement:** 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?

**Analysis:**
- **Known conditions:** 
  - Total coupons = 10
  - Coupons used = 6
  - Coupons left = Total coupons - Coupons used

This scenario fits the **Take-away** model because it involves taking away a certain number of items (coupons) from a total.

### Problem (b)
**Statement:** Tobias has saved $$ \$ 35 $$ toward the $$ \$ 45 $$ CD player he wants to buy. How much money does he have to add to his savings to purchase the player?

**Analysis:**
- **Known conditions:**
  - Amount saved = $$ \$ 35 $$
  - Cost of CD player = $$ \$ 45 $$
  - Amount needed = Cost of CD player - Amount saved

This scenario fits the **Missing addend** model because it involves finding out how much more money is needed to reach a total (the cost of the CD player).

### Summary of Models
- **Problem (a):** Take-away
- **Problem (b):** Missing addend

Thus, the answers are:
- (a) Take-away
- (b) Missing addend
- (a) Take-away - (b) Missing addend

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