Subtracting Tens and Ones

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Achievement Objectives
NA2-1: Use simple additive strategies with whole numbers and fractions.
Specific Learning Outcomes

Solve addition and subtraction problems by using place value partitioning.

Description of Mathematics

Number Framework Stage 5

Required Resource Materials
Ones and tens material, E.g. sticks in bundles, BeaNZ, money
Activity

The ones in the subtracted number should be greater than or equal to the ones in the second to avoid a renaming problem. For example 56 - 34 is fine but 57 - 29 is not. Problems like these are delayed until the students have part-whole thinking.

Using Materials

Examples. Word stories and recording for: 45 – 21, 52 – 23, 42 - 32 35 – 14, 63 –
61, 38 - 28....
 

Using Imaging

Shielding and Imaging Only examples. Instant recall of single digit subtraction facts is needed here. Word stories and recording for: 46 – 24, 55 – 25, 43 – 12, 37 – 21, 34 – 13, 46 - 41....

Using Number Properties

Examples. 97 – 10, 78 – 30, 20 + 62, 46 + 50, 80 + 17....
Challenging examples. The students will need to understand the meaning of three
digit numbers to do these. 240 – 20, 340 – 40, 443 – 20, 570 - 20....
 

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Level Two