Worked examples
Two examples
Example 1
Which expression means “5 less than a number”?
- “Less than” turns the order around.
- Start with the number, x, then take 5 away.
Answer: x − 5
Example 2
Which expression means “3 times the sum of a number and 4”?
- The sum, x + 4, is a group, so it goes in parentheses.
- Then multiply the group by 3.
Answer: 3(x + 4)
Where this is taught: Algebra Practice 1, “From words to symbols”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.