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Number Sense and Numeration:
- Addition and Subtraction Videos: Check these videos out if you'd like to see how some of the addition and subtraction methods are used.
202.MOVHow to solve an addition problem using decomposition and an open number line.
203.MOVHow to solve a subtraction problem using decomposition and an open number line.
204.MOVHow to subtract using an open number line and decomposition.
205.MOVHow to add up purchases using an open number line and decomposition.
206.MOVHow to find elapsed time using a number line.
207.MOVHow to solve a multi-step addition/subtraction problem by first modeling the problem using a parts-whole model.
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