Worked examples
Two examples
Example 1
You buy 3 notebooks at $2.49 each and pay with a $10 bill. How much change do you get?
- Step 1, the cost: 3 × 2.49 = 7.47.
- Step 2, the change: 10.00 − 7.47 = 2.53.
Answer: $2.53
Example 2
Apples cost $1.80 a pound. How much do 2.5 pounds cost?
- Multiply: 1.80 × 2.5 = 4.500.
- That is $4.50.
Answer: $4.50
Where this is taught: Quiz 13: Decimal Place Value, “Money is a decimal you already read”
The drill
Ten problems
This drill also has challenge problems. They use the same skill, set up the way the GED test sometimes sets up a problem, so that it looks new at first.
How many:
Type the amount only, like 12.50; the unit is already there. Then press Check my answers at the bottom.Write each answer on the line. The answer key, with the reasoning, is on the last page.