Sure! Let’s solve each problem step by step. The task is to find “X% of Y”, which means:
>
X% of Y = (X/100) × Y
We’ll solve all 20 problems, and for the first column (problems 1–10), I’ll show how to do them *without a calculator*, using mental math or simple fractions.
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✔ Column 1: Problems 1–10 (Try without calculator)
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1. 60% of 110
> 60% = 60/100 = 3/5
> So, 3/5 × 110 = (110 ÷ 5) × 3 = 22 × 3 =
66
✔ Answer: 66
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2. 50% of 90
> 50% = half → 90 ÷ 2 =
45
✔ Answer: 45
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3. 10% of 10
> 10% = 1/10 → 10 ÷ 10 =
1
✔ Answer: 1
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4. 40% of 80
> 40% = 4/10 = 2/5
> 2/5 × 80 = (80 ÷ 5) × 2 = 16 × 2 =
32
✔ Answer: 32
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5. 80% of 40
> 80% = 8/10 = 4/5
> 4/5 × 40 = (40 ÷ 5) × 4 = 8 × 4 =
32
✔ Answer: 32
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6. 40% of 35
> 40% = 0.4 → 0.4 × 35
> Think: 10% of 35 = 3.5 → 40% = 4 × 3.5 =
14
✔ Answer: 14
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7. 90% of 90
> 90% = 9/10 → (9/10) × 90 = 9 × 9 =
81
✔ Answer: 81
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8. 25% of 60
> 25% = 1/4 → 60 ÷ 4 =
15
✔ Answer: 15
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9. 40% of 20
> 40% = 0.4 → 0.4 × 20 =
8
✔ Answer: 8
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10. 25% of 120
> 25% = 1/4 → 120 ÷ 4 =
30
✔ Answer: 30
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✔ Column 2: Problems 11–20 (Calculator allowed, but we’ll still show steps)
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11. 75% of 90
> 75% = 3/4 → 90 ÷ 4 = 22.5 → 22.5 × 3 =
67.5
✔ Answer: 67.5
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12. 45% of 25
> 45% = 0.45 → 0.45 × 25
> Or: 10% of 25 = 2.5 → 40% = 10 → 5% = 1.25 → total = 10 + 1.25 =
11.25
✔ Answer: 11.25
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13. 35% of 75
> 35% = 0.35 → 0.35 × 75
> Break it: 30% of 75 = 22.5; 5% = 3.75 → total = 22.5 + 3.75 =
26.25
✔ Answer: 26.25
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14. 55% of 90
> 55% = 0.55 → 0.55 × 90
> 50% = 45; 5% = 4.5 → total = 45 + 4.5 =
49.5
✔ Answer: 49.5
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15. 95% of 14
> 95% = 0.95 → 0.95 × 14
> Or: 100% = 14; minus 5% (which is 0.7) → 14 - 0.7 =
13.3
✔ Answer: 13.3
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16. 42% of 46
> 42% = 0.42 → 0.42 × 46
> Compute: 0.4 × 46 = 18.4; 0.02 × 46 = 0.92 → total = 18.4 + 0.92 =
19.32
✔ Answer: 19.32
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17. 23% of 96
> 23% = 0.23 → 0.23 × 96
> 0.2 × 96 = 19.2; 0.03 × 96 = 2.88 → total = 19.2 + 2.88 =
22.08
✔ Answer: 22.08
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18. 58% of 88
> 58% = 0.58 → 0.58 × 88
> 0.5 × 88 = 44; 0.08 × 88 = 7.04 → total = 44 + 7.04 =
51.04
✔ Answer: 51.04
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19. 47% of 144
> 47% = 0.47 → 0.47 × 144
> 0.4 × 144 = 57.6; 0.07 × 144 = 10.08 → total = 57.6 + 10.08 =
67.68
✔ Answer: 67.68
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20. 39% of 238
> 39% = 0.39 → 0.39 × 238
> 0.4 × 238 = 95.2; minus 0.01 × 238 = 2.38 → 95.2 - 2.38 =
92.82
✔ Answer: 92.82
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## 📝 Final Answers (All 20):
1.
66
2.
45
3.
1
4.
32
5.
32
6.
14
7.
81
8.
15
9.
8
10.
30
11.
67.5
12.
11.25
13.
26.25
14.
49.5
15.
13.3
16.
19.32
17.
22.08
18.
51.04
19.
67.68
20.
92.82
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## 💡 Tips for Mental Math (First Column):
- Use fractions: 50% = 1/2, 25% = 1/4, 10% = 1/10, 20% = 1/5, etc.
- Break percentages: e.g., 40% = 4 × 10%, 35% = 30% + 5%
- Multiply by 10s and adjust decimals.
Let me know if you’d like a printable version or flashcards for practice! 😊
Parent Tip: Review the logic above to help your child master the concept of percentage worksheet grade 7.
