Let's solve each problem step by step using the
percentage formula:
$$
P = B \times R
$$
Where:
- $ P $ = Percentage (the part)
- $ B $ = Base (the whole)
- $ R $ = Rate (percent, expressed as a decimal)
We can rearrange this formula depending on what we're solving for:
- $ P = B \times R $
- $ R = \frac{P}{B} $
- $ B = \frac{P}{R} $
Remember: Convert percentages to decimals by dividing by 100.
For example: 18% = 0.18, 20% = 0.20, etc.
---
1. R = 18%, B = 27 → Find P
$$
P = B \times R = 27 \times 0.18 = 4.86
$$
✔ P = 4.86
---
2. B = 50, P = 25 → Find R
$$
R = \frac{P}{B} = \frac{25}{50} = 0.5 = 50\%
$$
✔ R = 50%
---
3. P = 2,450, R = 20% → Find B
$$
B = \frac{P}{R} = \frac{2450}{0.20} = 12,250
$$
✔ B = 12,250
---
4. R = 3%, B = 345 → Find P
$$
P = B \times R = 345 \times 0.03 = 10.35
$$
✔ P = 10.35
---
5. B = 80, P = 20 → Find R
$$
R = \frac{P}{B} = \frac{20}{80} = 0.25 = 25\%
$$
✔ R = 25%
---
6. R = 25%, P = 8 → Find B
$$
B = \frac{P}{R} = \frac{8}{0.25} = 32
$$
✔ B = 32
---
7. P = 18, B = 90 → Find R
$$
R = \frac{P}{B} = \frac{18}{90} = 0.2 = 20\%
$$
✔ R = 20%
---
8. B = 22, R = 50% → Find P
$$
P = B \times R = 22 \times 0.50 = 11
$$
✔ P = 11
---
9. R = 40%, B = 200 → Find P
$$
P = B \times R = 200 \times 0.40 = 80
$$
✔ P = 80
---
10. R = 80%, P = 16 → Find B
$$
B = \frac{P}{R} = \frac{16}{0.80} = 20
$$
✔ B = 20
---
✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 1. P = ? |
4.86 |
| 2. R = ? |
50% |
| 3. B = ? |
12,250 |
| 4. P = ? |
10.35 |
| 5. R = ? |
25% |
| 6. B = ? |
32 |
| 7. R = ? |
20% |
| 8. P = ? |
11 |
| 9. P = ? |
80 |
| 10. B = ? |
20 |
---
Let me know if you'd like this formatted as a printable worksheet or need explanations in simpler terms!
Parent Tip: Review the logic above to help your child master the concept of base 5 worksheet.
