Math 1 · Lesson 2 · part 5 of 5
Practice Problems
Try them, get help one step at a time, then print how it went.
Name that property
Eight quick ones. Type the property and whether it is about adding or multiplying, then check.
Practice: try it, then get help one step at a time
While you work, say the pair every time: the property name and the ordinary word. Which property? What does that word mean? So what are the numbers allowed to do?
My results
Finished the practice? Print a page that shows each question, what you typed or chose, the correct answer, and how it went. Good for showing a teacher or keeping in a folder.
Exit ticket
On paper or an index card. Use the math word and the everyday word.
- Why is it called the commutative property? What does "commute" mean?
- Show with your own numbers that subtraction is not commutative.
- Rewrite 15 - 6 so that it commutes, and show it works.
Check your exit ticket
- Because the numbers commute: they travel back and forth, trading places, and the answer does not change.
- Any pair works, for example 8 - 3 = 5 but 3 - 8 = -5.
- 15 + (-6) = 9 and (-6) + 15 = 9. Once subtraction is written as adding the opposite, it commutes.