This question can be solved quite easily. So, how much change should Liz get from a twenty-dollar bill if her favourite musical group's CD costs $15.24 including tax?
The best way to do this is to round up to $20:
- Let's round the 24c up to $1.
- Number bonds to 10 mean that 24c + 6c = 30c. And 30c + 70c = $1.
- So we've rounded up to $16 using 76c. The next bit is easy.
- $16 + $4 = 20.
- So... $4 + 76c = $4.76.
Liz should get $4.76 change!
You might find this method in this video helpful - it's in Pounds Sterling but it should still show you the same thing - this method uses a number line: