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Addition using number lines and 'family of facts' ( 6 + 41 is same as 41 + 6)
Subtraction using number lines.
Tidy numbers. Adding tens first then ones. Using 100's board.
Tidy Numbers. Subtracting tens then ones. Using 100's board.
Compensating.
9+6 = same as 10+5
Video of compensating.
Compensating in subtraction.
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