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Explaining and solving number sentences

1/6/2014

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In our first week back of term 2 we took some simple incomplete addition number sentences and attempted to explain their meaning by inverting the calculation, creating 2 addition facts and 2 subtraction facts from the first number sentence. e.g. 12 + ? = 27 can be rearranged to form: ? + 12 = 27 and 27 - ? = 12, 27 - 12 = ?.
We then looked at which of these facts could be used easily to help us solve and complete the number sentence. 

We also looked at finding the difference between 2 numbers and worked hard to explain the methods we were using to solve number sentences. Alongside our Big Maths challenge, the class also managed to finish 2 loop card games reciting the 2x and 10x table facts both in under 60 seconds! Next week we will see how much quicker we can complete them. A good start back to the term, well done Maths group.
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