Worked examples
Two examples
Example 1
You buy 3 shirts at $12 each and pay with a $50 bill. How much change do you get?
- Step 1, the cost: 3 × 12 = 36.
- Step 2, the change: 50 − 36 = 14.
Answer: $14
Example 2
A worker earns $18 an hour. She works 8 hours a day, 5 days a week. How much does she earn in a week?
- Step 1, a day’s pay: 18 × 8 = 144.
- Step 2, a week: 144 × 5 = 720.
Answer: $720
Where this is taught: Quizzes 3, 4 and 5, on the four operations, starting with Quiz 3
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 number only; 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.