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Imaging Many Hands

Achievement Objectives:

Achievement Objective: NA1-1: Use a range of counting, grouping, and equal-sharing strategies with whole numbers and fractions.
AO elaboration and other teaching resources

Specific Learning Outcomes: 

Solve addition problems to 20 by counting all the objects in their head.

Solve subtraction problems from 20 by counting all the objects in their head.

Solve subtraction problems to 100 by counting back in their heads.

Description of mathematics: 

Number Framework Stages 3 and 4

Activity: 

Shielding:

Problem: Leanne has 8 sweets and she buys 5 more sweets. How manydoes she have now?

Write 5 + 8 on the board. In pairs the students discuss who would show 8 fingers and who would show 5 fingers without showing the fingers. They discuss how they would put 5 and 5 together to give 10 and 3 fingers by showing fingers if needed. Have thegroup discuss their methods. Write 5 + 8 = 13 on the board.

Examples. Word stories and recording for: 20 – 5, 5 + 9, 15 – 10, 20 - 15 , 17 – 7, 12 + 5, 7 + ? = 12....

Imaging Only:

Problem: What does 5 + 7 equal?

Write 5 + 7 on the board. Each student solves the problem independently by imagining 5 and 7.

Examples. Work out and record: 11 – 5, 5 + 6, 11 - 10, 12 – 2, 15 – 5, 11 + 5, 6 -  ? = 5...