Near Doubles

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Relevant and up-to-date teaching resources are being moved to Tāhūrangi (tahurangi.education.govt.nz). 
When all identified resources have been successfully moved, this website will close. We expect this to be in June 2024. 
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For more information visit https://tahurangi.education.govt.nz/updates-to-nzmaths

Achievement Objectives
NA3-1: Use a range of additive and simple multiplicative strategies with whole numbers, fractions, decimals, and percentages.
Specific Learning Outcomes

Solve addition and subtraction problems by compensating with tidy numbers (including equal additions).

Description of Mathematics

Numebr Framework Stage 6

Required Resource Materials
Play money (Material Master 4-9)
Activity

Using Materials

Problem: “Work out 153 + 147.”

Record 153 + 147 on the board or modelling book. Show $153 and $147 with play money. Discuss the fact that transferring $3 gives $150 and $150, so the answer is obviously $300. Record the answer on the board or modelling book.

Problem: “To work out 79 + 79, Harry works out $80 + $80 with play money first and then says 79 + 79 must be 158.” Discuss Harry’s method. Record the answer on the board or modelling book.

Examples: Work out: 149 + 149 352 + 348 350 + 352 104 + 96 ...

Using Imaging

Examples: Word stories and recording for: 440 + 439,  248 + 252,  349 + 350,   202 + 198 ...

Using Number Properties

Examples: Word stories and recording for: 150 + 149,  448 + 452, 147 + 153,  502 + 498,  1 009 + 991,  9 996 + 10 004 ...

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Level Three