Let’s work through each problem step by step using the area model.
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Problem 1: 12 × 16
We break 12 into 10 + 2
We break 16 into 10 + 6
Now multiply each part:
- 10 × 10 = 100
- 10 × 6 = 60
- 2 × 10 = 20
- 2 × 6 = 12
Add them up:
100 + 60 + 20 + 12 = 192
So,
12 × 16 = 100 + 60 + 20 + 12
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Problem 2: 11 × 14
Break 11 into 10 + 1
Break 14 into 10 + 4
Multiply each part:
- 10 × 10 = 100
- 10 × 4 = 40
- 1 × 10 = 10
- 1 × 4 = 4
Add them up:
100 + 40 + 10 + 4 = 154
So,
11 × 14 = 100 + 40 + 10 + 4
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Problem 3: 13 × 15
Break 13 into 10 + 3
Break 15 into 10 + 5
Multiply each part:
- 10 × 10 = 100
- 10 × 5 = 50
- 3 × 10 = 30
- 3 × 5 = 15
Add them up:
100 + 50 + 30 + 15 = 195
So,
13 × 15 = 100 + 50 + 30 + 15
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Final Answer:
1. 12 × 16 = 100 + 60 + 20 + 12
2. 11 × 14 = 100 + 40 + 10 + 4
3. 13 × 15 = 100 + 50 + 30 + 15
Parent Tip: Review the logic above to help your child master the concept of area model multiplication 4th grade worksheet.