Nines and Eights
This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework.
AO elaboration and other teaching resources
This page provides a strategy for subtracting nine, which students often have difficulty doing. Encourage students to record their results so that they can see the patterns.
Answers to Activity
1. a. 4
2. To find the answer to a two-digit number minus 9, take 1 off the tens digit and add 1 to the ones digit, for example,
3. Take 1 off the tens digit and add 2 to the ones digit.
4. a. 6