This task is from Tools for NC Teachers.  Students write, represent,and solve equations for given situations. These tasks focus on multiplicative reasoning. This is remixable. 

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For each problem, write at least one multiplication equation with a symbol for the unknown AND one division equation with a symbol for the unknown. Draw a model to represent your equations.

The fourth graders collected 210 cans of food this week during their canned food drive for the community center.  On Monday, they collected 70 cans.  On Wednesday, twice as many cans were collected as on Monday.  How many cans did the students collect on Wednesday?

Ask students to model/explain their solutions.