Addition and Subtraction methods

We looked at how to add or subtract a multiple of 10 from a 2 digit number. You can use a 100 square to help you count on or back in jumps of 10.

E.g  87-50=37. 

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We looked at adding and taking away to/from a 2 digit number by partitioning and counting up/down on a number line.

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We tried to use these methods in our problem solving.

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Some of us are getting very good at using these informal methods, recording and explaining our ideas.

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