Multiple Ways to Add and Subtract
These exercises and activities are for students to use independently of the teacher to practise number properties.
use common factors to help solve addition and subtraction problems
Addition and Subtraction, AM (Stage 7)
Prior knowledge
eg 15 x 6 = (10 x 6) + (5 x 6) = 90
Background
The strategy in this activity involves finding a common factor of numbers in an addition problem. For example, 27 + 45 a common factor of 27 and 45 is 9. So 27 + 45 = (3 x 9) + (5 x 9). Then by using the distributive property the equation can be rearranged as 27 + 45 = (3 x 9) + (5 x 9) = 8 x 9 = 72.
Comments on the Exercises
Asks students to solve addition problems using common factors and the distributive law.
Exercise 2
Asks students to decide if problems have correctly been solved using common facts and the the distributive law.
| Attachment | Size |
|---|---|
| MultipleWaysSheet.pdf | 92.27 KB |
| MultipleWaysSheet.doc | 52.5 KB |
| MultipleWaysHW.pdf | 88.95 KB |
| MultipleWaysHW.doc | 49 KB |
| MultipleWaysLoopy.pdf | 76.38 KB |
| MultipleWaysLoopy.doc | 48.5 KB |
| LoopyMaster.doc | 44.5 KB |
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