Before you trust an answer, ask whether it could even be true. A quick estimate is usually enough to tell you.
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By the end of this lesson your student should be able to use the Examine step of the four-step plan to judge whether a stated answer to a decimal word problem is reasonable, by comparing it with a rounded estimate.
🚨 Estimating and then doing nothing with it. The estimate only matters when it's compared with the claim, so have the student say aloud whether the two are close.
Rounding everything the same direction. Rounding a price like $24.99 up and $9.50 up is fine, but the student should know the estimate can be a little off, and ask whether the gap between estimate and claim is bigger than that.
Make up claims that are wrong in different ways: too big, too small, and a decimal point in the wrong place. Having the student spot all three builds the habit better than checking right answers.
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Before You Start
The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.
Part One
Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.
Part Two
The word cards are at the top of this page. Look back at them as often as you need, then answer.