For the picture on the four slides below, think about how you would break it up, in order to figure out how many marbles there are (without counting them all one-by-one).
Try to use both multiplication and addition (or subtraction) in your strategy.
Show how you grouped the marbles on the picture. (Instructions on how to do this are on the next slide.) A complete example slide is below that slide.
Explain your strategy in words, and
Show your strategy as an equation (or equations) with multiplication and addition (or subtraction).

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