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

Specific Learning Outcomes:

Solve addition problems to 20 by joining sets and counting all the objects.

Solve subtraction problems from 20 by separating sets and counting all the objects.

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.

Instantly recognise patterns to 10 including doubles.

Description of mathematics:

Number Framework Stages 2 and 3.

Activity:

#### Using Materials

Problem: Tana has 7 plastic bears and he hides some.  Now his sister can see 2 bears.  How many bears did Tana hide?

Write 7 - ? = 2 on the board.  The students model 7 fingers as 5 and 2 and solve the problem.  Record the answer on the board.

Examples. Word stories and recordign for 8- ? = 5, 10 - ? = 8, 5 + ? = 7, 3 + ? = 8, 7 + ? = 10.

### Using Imaging

#### Shielding.

Problem: Margaret has 5 stickers on her school bag and she adds 3 more.  How many stickers does she have now?

Write 5 + 3 on the board.  The students put both hands behind their backs and think about the answer. If need fold back to Using Materials.  teh studetns bring their hands in front of them and solve the problem. Record the answer on the board.  Examples. Word stories and recording for: 10 -? = 9, 6 - ? = 1, 5 + ? = 9, 3 + ? = 8, 5 + ?= 10.

#### Imaging Only:

Problem: What is the missing number: 9 - ? = 4.

Write 9 - ? = 4 on the board. The students think about the solution without using fingers behind their backs.  Record the answer on the board.

Examples: Word stories and recording for 6 - ? = 5, 9 - ? = 4, 1+ ? = 6, 5 + ? = 7, 7 +? = 10