Breaking a Whole into Two Parts: Take Apart Stories with Missing Parts

You will meet this idea in ordinary days. A mother knows twelve eggs came home and four are gone. She does not need to count the carton to know eight remain. This is worth learning because finding a missing part is the same thinking you will use for subtraction facts.

Watch for it today, and when you spot it, tell someone what you noticed and how you knew. Here is today’s math treasure. A take apart story runs the other direction. You know the whole and one part, and you hunt for the missing part.

Ten pieces of fruit sit in a bowl. Six are apples. The rest are pears. How many pears? Count up from six to ten, or take six away from ten. Either way, four pears. The whole never changes here. You are simply figuring out how it was split.

Try it with a number bond. Draw the whole in a circle with two lines coming down to two smaller circles. Write ten in the whole, six in one part, and leave the other part blank. Seeing the shape of the problem often makes the answer obvious before you compute. Take your time. Careful is better than fast.