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P1 Hong Kong Coins: Paper 1 Basics
P1 Hong Kong Coins: Paper 1 Basics
This paper starts with recognising coins: total equal-value coins by multiplication, convert between dollars and cents, handle simple change, and compare amounts in one unit.
Direct answers Answers: 1 10 dollars; 2 19 dollars; 3 80 cents; 4 100 cents, one dollar; 5 $3.50 change; 6 20 dollars; 7 2 notes; 8 200 cents; 9 20 dollars, two notes; 10 no, 50 cents more.
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: P1 Hong Kong Coins |
| Level | P1 |
02 Questions (10 items)
- FoundationFive 2-dollar coins are worth how much?
- FoundationThree 5-dollar notes plus two 2-dollar coins make how much?
- FoundationA 50-cent, a 20-cent and a 10-cent coin are worth how many cents?
- IntermediateTen 10-cent coins are worth how many cents, and how many dollars?
- IntermediateA pen costs 6 dollars 50 cents. How much change from 10 dollars?
- IntermediateA book costs 12 dollars and a bag costs 8 dollars. What is the total?
- ChallengeHow many 10-dollar notes make 20 dollars?
- ChallengeHow many cents are in 2 dollars?
- ChallengeFour 5-dollar coins are worth how much, and how many 10-dollar notes have the same value?
- Error redoError clinic: someone says two dollars is less than 150 cents. Is that right? Compare in cents.
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 10 dollars. 2 times 5 is 10. | Coins of the same value can be added with multiplication. |
| 2 | 19 dollars. 5 times 3 is 15 and 2 times 2 is 4, so 15 plus 4 is 19. | Total the notes and the coins separately, then add. |
| 3 | 80 cents. 50 plus 20 plus 10 is 80. | One dollar is 100 cents, so 80 cents can also be read as 8 ho. |
| 4 | 100 cents, which is 1 dollar. 10 times 10 is 100 cents. | Ten lots of 10 cents make 100 cents, exactly one dollar. |
| 5 | $3.50 change. 1000 minus 650 is 350 cents. | Treat 10 dollars as 1000 cents, then subtract the price. |
| 6 | 20 dollars. 12 plus 8 is 20. | Add the two prices directly. |
| 7 | 2 notes. 20 divided by 10 is 2. | Changing money keeps the total value the same. |
| 8 | 200 cents. One dollar is 100 cents, so 2 times 100 is 200. | Multiply by 100 to change dollars into cents. |
| 9 | 20 dollars, which is two 10-dollar notes. 5 times 4 is 20, and 20 divided by 10 is 2. | Total the coins first, then convert the unit. |
| 10 | No. Two dollars is 200 cents, which is 50 cents more than 150 cents. | Convert to the same unit before comparing; dollars and cents cannot be compared digit by digit. |
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.
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