![]() Or any other variety of ways to see the quantity as it makes sense to them. We are laying the foundation for students to be able to eventually solve 53+12 and see that they can manipulate it: The simple answer is because there is value in students being able to see the groupings, relationships and patterns in numbers. Why do we expect them to decompose and compose numbers? Little did I know what I’d find when teaching it daily in our calendar routine and small group math lessons. When I first came across this standard, I was confused and felt like I truly didn’t understand the value in teaching it. The second is expressing this break down using equations. ![]() The first is using objects and words to show that teen numbers have a group of ten and some ones.There are two main pieces of this standard: ![]() This is part 1 – why would we teach this standard in kindergarten and why do I even talk about it so much on this blog? Understanding decomposing/composing numbers as teachers So the area of the entire figure is 42 square meters. And one 10 and two 10's or a 10 and a 20 is 30. Since there is so much to cover – I’ve broken it down into three parts. Decomposition is a method of subtraction by using the method. So we have six square meters, plus nine square meters, plus 27, and we can solve that, six plus nine is 15, 15 plus 27, let's see, five ones and seven ones is 12 ones.
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