Need help with algorithms??

We are all so good now at mental addition (even two digit numbers) that were ready to learn about another strategy for addition – the algorithm. Once we had figured out how they work, Mary asked us to make a video teaching others how to do them. We had to be very precise with our mathematical language and this was quite challenging. We got quite technical with our feedback to each other about the words we used to explain the algorithm. Here is one of the best explanations from our class, from Chloe and Keeley who worked together. Watch and learn…

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What strategy do you use when you are adding???