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Level Two > Number and Algebra

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.

Achievement Objectives:

Achievement Objective: NA2-1: Use simple additive strategies with whole numbers and fractions.
AO elaboration and other teaching resources

Specific Learning Outcomes: 

subtract 9

subtract 8

Required Resource Materials: 
FIO, Level 3, Basic Facts, Nines and Eights, page 4

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
b. 9
c. 7
d. 1
e. 17
f. 23
g. 66
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
b. 9
c. 15
d. 92
e. 46