Composing & Decomposing
The purpose of composing and decomposing is to simplify the mathematics. It is an essential skill for making calculating easier because it is all about making and then using friendlier numbers. Learners will encounter scenarios where they may need to join or separate, to identify the parts that make up a whole, and to compare the parts. Equivalence must be maintained within each manipulation. Thinking flexibly about putting numbers together as well as taking them apart leads to a greater understanding of relationships not only between numbers and operations but in all strands of mathematics.