Notes and prices · Usually met around P2
Notes: knowing, counting and changing them
Count the biggest notes first.
How to do it
Method
Count the biggest notes first
100 + 100 + 50 + 20 + 10 = $280
Another way
Like with like
200 + 50 + 30 = 280
In full
Hong Kong's notes are $10, $20, $50, $100, $500 and $1000. To count a pile of money, start with the biggest and go down: 100, 200, 250, 270, 280. To change notes, think how many small ones make one big one: one $100 = two $50s = five $20s = ten $10s. For the same money, the bigger the note, the fewer you need. Or put the same notes together, work out each kind's value, then add them up.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
How much money is in the picture?
Show the answer and working
Answer: 200 dollars
Start with the biggest note and add them one by one: $200.
Example 2
Ka-yee pays $300 using only one kind of note. Which kind of note means the fewest notes?
- A. $50 notes
- B. $20 notes
- C. $10 notes
- D. $100 notes
Choose the right answer
Show the answer and working
Answer: D. $100 notes
The bigger the note, the fewer you need: for $300, $100 notes take the fewest.
Example 3
Change $520 into $100 and $10 notes, using as few notes as possible: □ $100 notes and □ $10 notes.
Fill in each box
Show the answer and working
Answer: 5，2
Use $100s as far as you can: 520 has 5 hundreds, and the rest takes 2 $10 notes.
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