Let's solve each subtraction problem in the worksheet
"Subtraction: Money Across Zero". These problems involve subtracting amounts of money where borrowing across zero is required (e.g., subtracting from a number like $4.00, where you need to borrow from the dollars to subtract cents).
We'll go through each problem step by step.
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a) $4.00 – $3.79
Break it down:
- $4.00 = 400 cents
- $3.79 = 379 cents
- 400 – 379 = 21 cents →
$0.21
Answer: $0.21
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b) $6.00 – $2.16
- $6.00 = 600 cents
- $2.16 = 216 cents
- 600 – 216 = 384 cents → $3.84
Answer: $3.84
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c) $7.00 – $1.73
- $7.00 = 700 cents
- $1.73 = 173 cents
- 700 – 173 = 527 cents → $5.27
Answer: $5.27
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d) $9.00 – $0.97
- $9.00 = 900 cents
- $0.97 = 97 cents
- 900 – 97 = 803 cents → $8.03
Answer: $8.03
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e) $8.00 – $7.33
- $8.00 = 800 cents
- $7.33 = 733 cents
- 800 – 733 = 67 cents → $0.67
Answer: $0.67
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f) $5.00 – $0.91
- $5.00 = 500 cents
- $0.91 = 91 cents
- 500 – 91 = 409 cents → $4.09
Answer: $4.09
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g) $1.00 – $0.52
- $1.00 = 100 cents
- $0.52 = 52 cents
- 100 – 52 = 48 cents → $0.48
Answer: $0.48
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h) $4.00 – $2.67
- $4.00 = 400 cents
- $2.67 = 267 cents
- 400 – 267 = 133 cents → $1.33
Answer: $1.33
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i) $9.00 – $6.20
- $9.00 = 900 cents
- $6.20 = 620 cents
- 900 – 620 = 280 cents → $2.80
Answer: $2.80
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j) $8.00 – $7.70
- $8.00 = 800 cents
- $7.70 = 770 cents
- 800 – 770 = 30 cents → $0.30
Answer: $0.30
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k) $6.00 – $2.45
- $6.00 = 600 cents
- $2.45 = 245 cents
- 600 – 245 = 355 cents → $3.55
Answer: $3.55
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l) $2.00 – $0.82
- $2.00 = 200 cents
- $0.82 = 82 cents
- 200 – 82 = 118 cents → $1.18
Answer: $1.18
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✔ Final Answers:
| Problem | Answer |
|--------|----------|
| a | $0.21 |
| b | $3.84 |
| c | $5.27 |
| d | $8.03 |
| e | $0.67 |
| f | $4.09 |
| g | $0.48 |
| h | $1.33 |
| i | $2.80 |
| j | $0.30 |
| k | $3.55 |
| l | $1.18 |
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🔍 Explanation of "Across Zero":
These problems are called
"Money Across Zero" because when subtracting, you often need to
borrow from the dollar amount (which is a whole number), and the
cents part becomes zero, so you have to
regroup (e.g., $4.00 becomes $3.99 + 1 cent). This requires careful handling of place value.
For example, in
$4.00 – $3.79:
- You can't subtract 79 cents from 0 cents, so you
borrow $1 (100 cents), making it $3.00 + 100 cents = $3.100.
- Then subtract: $3.100 – $3.79 = $0.21.
This concept is essential for understanding regrouping in decimals and real-world money transactions.
Let me know if you'd like these shown with step-by-step regrouping!
Parent Tip: Review the logic above to help your child master the concept of subtraction across zeros worksheet 2nd.
