They will decompose numbers drawing and using objects. Most elementary math programs teach an addition formula called 'partial sums,' which is based on decomposition. Students are used to working with whole numbers (using objects to make 5) and will now learn that numbers can be broken into parts (2 and 3 are the same as 5). To decompose in basic operations, such as addition, subtraction, multiplication and division, means to take numbers apart in a problem to make it easier to understand and solve.
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