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P6 Maths: Simple Interest (Paper 4 (error clinic))
Tutor Prep Guide · The simple-interest formula I = P x R x T, substituting principal and annual rate, converting months to years, finding P, R or T from the interest, and the amount A = P + I
P6 Maths: Simple Interest (Paper 4 (error clinic))
Paper 4 (error clinic): ten simple-interest questions with answers and one-line notes.
Direct answers Level: P6 maths; format: the simple-interest formula, months as years, finding P or R, and the amount.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P6 Maths: Simple Interest |
| Level | P6 |
02 Questions (10 items)
- Foundation(Error clinic) Using 0.5 for 5% gives 500 for $1000 in 1 year. What is the correct interest?
- FoundationPrincipal $2000 at 6% per year for 3 months. Find the simple interest.
- IntermediateThe simple interest is $180 on $1500 for 2 years. Find the annual rate.
- Intermediate(Error clinic) Someone computed 2000 x 4 x 2 = 16000 for $2000 at 4% for 2 years. What is the correct interest?
- IntermediatePrincipal $900 at 5% per year for 2 years. Find the amount.
- ChallengeThe simple interest is $144 on $1200 at 4% per year. Find the time.
- Challenge(Error clinic) Treating 2.5% as 25% gives 2000 for $4000 over 2 years. What is the correct interest?
- ChallengePrincipal $2000 at 5% per year for 18 months. Find the simple interest.
- FoundationPrincipal $3000 at 3% per year is kept for 1 year and for 2 years. What is the difference in interest?
- Error redo(Error clinic) For $6000 at 4% for 2 years someone gave 480 as the amount. What is the correct amount?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | $50 | 5% is 0.05, so 1000 x 0.05 x 1 = 50. |
| 2 | $30 | 3 months is 0.25 year, so 2000 x 0.06 x 0.25 = 30. |
| 3 | 6% | R = 180 x 100 / (1500 x 2) = 6. |
| 4 | $160 | 4% must be written 0.04, so 2000 x 0.04 x 2 = 160. |
| 5 | $990 | Interest is 90, so the amount is 900 + 90 = 990. |
| 6 | 3 years | T = 144 x 100 / (1200 x 4) = 3. |
| 7 | $200 | 2.5% is 0.025, so 4000 x 0.025 x 2 = 200. |
| 8 | $150 | 18 months is 1.5 years, so 2000 x 0.05 x 1.5 = 150. |
| 9 | $90 | One year earns 90 and two years earn 180, a difference of 90. |
| 10 | $6480 | 480 is only the interest; the amount is 6000 + 480 = 6480. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Check the answers, copy the working of any wrong item, then try another paper of this chapter.Tutor Registration →
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