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Let's solve each section of this Measurement Conversions: Time – Minutes and Hours (A) worksheet step by step.

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🔷 Section A: Convert the following to minutes

We know:
> 1 hour = 60 minutes

So:

| Time | Minutes |
|------|--------|
| 1 hour | $1 \times 60 = 60$ minutes |
| 2 hours | $2 \times 60 = 120$ minutes |
| 3 hours | $3 \times 60 = 180$ minutes |
| 5 hours | $5 \times 60 = 300$ minutes |

Now mixed time:

| Time | Minutes |
|------|--------|
| 1 hour and 40 minutes | $60 + 40 = 100$ minutes |
| 4 hours and 15 minutes | $4 \times 60 + 15 = 240 + 15 = 255$ minutes |
| $10\frac{1}{2}$ hours | $10 \times 60 + \frac{1}{2} \times 60 = 600 + 30 = 630$ minutes |
| 6 hours and 45 minutes | $6 \times 60 + 45 = 360 + 45 = 405$ minutes |

✔ Section A Answers:
- 1 hour → 60 min
- 2 hours → 120 min
- 3 hours → 180 min
- 5 hours → 300 min
- 1 hr 40 min → 100 min
- 4 hr 15 min → 255 min
- $10\frac{1}{2}$ hrs → 630 min
- 6 hr 45 min → 405 min

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🔷 Section B: What fraction of an hour?

We know:
> 1 hour = 60 minutes
So, minutes as a fraction of an hour = $\frac{\text{minutes}}{60}$

Simplify each fraction.

| Minutes | Fraction of an hour |
|--------|---------------------|
| 15 min | $\frac{15}{60} = \frac{1}{4}$ |
| 45 min | $\frac{45}{60} = \frac{3}{4}$ |
| 20 min | $\frac{20}{60} = \frac{1}{3}$ |
| 40 min | $\frac{40}{60} = \frac{2}{3}$ |
| 10 min | $\frac{10}{60} = \frac{1}{6}$ |
| 5 min | $\frac{5}{60} = \frac{1}{12}$ |
| 35 min | $\frac{35}{60} = \frac{7}{12}$ |

✔ Section B Answers:
- 15 min → $\frac{1}{4}$
- 45 min → $\frac{3}{4}$
- 20 min → $\frac{1}{3}$
- 40 min → $\frac{2}{3}$
- 10 min → $\frac{1}{6}$
- 5 min → $\frac{1}{12}$
- 35 min → $\frac{7}{12}$

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🔷 Section C: How many minutes in each fraction of an hour?

Multiply each fraction by 60 minutes.

| Fraction | Minutes |
|--------|--------|
| $\frac{1}{5}$ hour | $\frac{1}{5} \times 60 = 12$ min |
| $\frac{2}{5}$ hour | $\frac{2}{5} \times 60 = 24$ min |
| $\frac{3}{5}$ hour | $\frac{3}{5} \times 60 = 36$ min |
| $\frac{4}{5}$ hour | $\frac{4}{5} \times 60 = 48$ min |
| $\frac{11}{12}$ hour | $\frac{11}{12} \times 60 = 55$ min |
| $\frac{1}{10}$ hour | $\frac{1}{10} \times 60 = 6$ min |
| $\frac{3}{10}$ hour | $\frac{3}{10} \times 60 = 18$ min |
| $\frac{5}{6}$ hour | $\frac{5}{6} \times 60 = 50$ min |

✔ Section C Answers:
- $\frac{1}{5}$ → 12 min
- $\frac{2}{5}$ → 24 min
- $\frac{3}{5}$ → 36 min
- $\frac{4}{5}$ → 48 min
- $\frac{11}{12}$ → 55 min
- $\frac{1}{10}$ → 6 min
- $\frac{3}{10}$ → 18 min
- $\frac{5}{6}$ → 50 min

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🔷 Section D: Convert minutes to hours and minutes

We know:
> 1 hour = 60 minutes
So divide total minutes by 60. The quotient is hours, remainder is minutes.

| Minutes | Hours and Minutes |
|--------|-------------------|
| 95 min | $95 \div 60 = 1$ R35 → 1 hour 35 minutes ✔ (given) |
| 150 min | $150 \div 60 = 2$ R30 → 2 hours 30 minutes |
| 200 min | $200 \div 60 = 3$ R20 → 3 hours 20 minutes |
| 237 min | $237 \div 60 = 3$ R57 → 3 hours 57 minutes |
| 108 min | $108 \div 60 = 1$ R48 → 1 hour 48 minutes |
| 132 min | $132 \div 60 = 2$ R12 → 2 hours 12 minutes |
| 245 min | $245 \div 60 = 4$ R5 → 4 hours 5 minutes |

✔ Section D Answers:
- 150 min → 2 hours 30 minutes
- 200 min → 3 hours 20 minutes
- 237 min → 3 hours 57 minutes
- 108 min → 1 hour 48 minutes
- 132 min → 2 hours 12 minutes
- 245 min → 4 hours 5 minutes

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✔ Final Answer Summary:

#### Section A:
- 1 hour → 60 min
- 2 hours → 120 min
- 3 hours → 180 min
- 5 hours → 300 min
- 1 hr 40 min → 100 min
- 4 hr 15 min → 255 min
- $10\frac{1}{2}$ hrs → 630 min
- 6 hr 45 min → 405 min

#### Section B:
- 15 min → $\frac{1}{4}$
- 45 min → $\frac{3}{4}$
- 20 min → $\frac{1}{3}$
- 40 min → $\frac{2}{3}$
- 10 min → $\frac{1}{6}$
- 5 min → $\frac{1}{12}$
- 35 min → $\frac{7}{12}$

#### Section C:
- $\frac{1}{5}$ hr → 12 min
- $\frac{2}{5}$ hr → 24 min
- $\frac{3}{5}$ hr → 36 min
- $\frac{4}{5}$ hr → 48 min
- $\frac{11}{12}$ hr → 55 min
- $\frac{1}{10}$ hr → 6 min
- $\frac{3}{10}$ hr → 18 min
- $\frac{5}{6}$ hr → 50 min

#### Section D:
- 150 min → 2 h 30 min
- 200 min → 3 h 20 min
- 237 min → 3 h 57 min
- 108 min → 1 h 48 min
- 132 min → 2 h 12 min
- 245 min → 4 h 5 min

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