Subtracting Tens
Solve addition and subtraction problems using groups of ten.
Solve addition and subtraction problems by using place value partitioning.
Number Framework Stages 4 and 5
Required Knowledge
Before attempting this activity check that the students can instantly recall the single digit subtraction facts.
Using Materials
Examples. Word stories and recording for: 45 – 20, 52 - 10, 42 – 20, 35 – 30, 63 – 50, 48 - 30....
Using Imaging
Shielding and Imaging Only: Examples. (Instant recall of single digit subtraction facts is needed here.) Word stories and recording for: 48 – 40, 51 – 20, 53 – 50, 27 – 20, 64 – 10, 43 – 40, 57 – 50, 71 - 40....
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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