- (10n + 5) squared
- from a square number, go a bit more and a bit less and multiply them
- 31 squared and 29 squared
- units sum to 10, in a long multiplication sum
these involve (a + b) squared, the difference of two squares and (a - b) squared
they could be a starting place for a study of these expansions
all start with number calculations (long multiplication practice) and move on to consider
related images (an array) and then
expanding quadratic brackets examples (which play automatically)
ppts are here:
1. (10n + 5)^2
2. 24 x 16
3. 31 ^ 2
4. 42 x 28
task 1
task 2
task 3
task 4
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