Five pages that build up the bar model (also called a tape diagram) one step at a time. On pages 1 and 2 the bars are drawn with the story's numbers printed in them and a ? where the unknown goes, so students only read the model and solve. Page 3 draws the bars empty: students write the story's numbers in the right places. Page 4 does the same with two bars, one a person, for compare stories. On page 5 students draw the whole model themselves, and the key shows one way to draw it. The model shows whether to add (the whole is missing) or subtract (a part or the difference is missing). Every page starts with a worked example.
Before page 1, build a bar with two colors of linking cubes: 45 red and 28 green would be long, so use one cube for each ten and talk about the parts and the whole. On page 5, put two different drawings of the same story side by side and ask whether both are right: a bar model does not have to be drawn to scale.
Draw a long rectangle on scrap paper and split it in two: "We had 52 crackers. We ate 18. How many are left?" Label the whole and the part you know, and put a ? on the part to find.
This pack supports the following Common Core State Standards for Mathematics:
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A 5-page bar model (tape diagram) pack for 2nd grade, with story problems within 100. Read bar models with a ? for the unknown, write the story's numbers into the bars, compare with two bars, and draw a bar model of your own. Every kind of story: adding, taking away, parts and wholes, comparing, and unknown starts and changes. Every page comes in color and in black and white. Answer keys included.
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