Worked examples
Two examples
Example 1
You flip a coin and roll a number cube. What is the probability of heads and a 4?
- They do not affect each other, so multiply: 12 × 16.
Answer: 112
Example 2
You roll a number cube twice. What is the probability of a 6 both times?
- 16 × 16.
Answer: 136
Where this is taught: Quiz 34: Probability and Counting, “Two things happening together”
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 a fraction with a slash, like 3/4, and a mixed number with a space, like 2 1/4. Give answers in simplest form. Then press Check my answers at the bottom.Write each answer on the line, in simplest form. The answer key, with the reasoning, is on the last page.