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What's Hidden?

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
Achievement Objective: NA1-3: Know groupings with five, within ten, and with ten.
AO elaboration and other teaching resources

Specific Learning Outcomes: 

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

Recall facts within 5, and doubles to 10.

Description of mathematics: 

Number Framework Stage 3

Required Resource Materials: 
Plastic teddies or counters.

Problem: Here are 3 teddies and hidden under the container there are some more. Altogether there are 5 teddies. How many teddies are hidden?

Record 3 + ? = 5. The students solve the problem by imagining the numbers. Fold back if needed to Using Materials by showing what is hidden.

Examples. Put students in pairs. One student hides some teddies and the other solves the problem. Then reverse roles.