Subtracting to 100,000

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The students learn to subtract to 100,000.

-4.NBT.B.4

Students will be able to subtract to 100,000 with and without regrouping of the ten-thousands, thousands, hundreds, or tens number.

Have the students solve the story problem.

Show the problem 34,650 - 3,116. Explain that you first subtract the thousands numbers, then the hundreds numbers, tens numbers and ones values. You start to the right of the number line, at 34,650. There, 3,000 is first subtracted, then, you come to 31,650. Next you take away 100, then 10 and finally 6 to reach the answer. After this, show the students the problem 78,748 - 41,627 and have them solve the intermediate steps on their own and fill them in on the lines. Then you show the problem 49,135 - 7,982 and ask the students how they would solve it. Then show the solving strategies used by the children on the whiteboard. Have the students solve the next few problems on their own.

Check whether the students can subtract to 100,000 by asking the following question:

- Which method do you use to solve this problem in steps? (69,485 - 45,122 = ... )

The students are given ten questions in which they first practice solving two problems without regrouping the tens number, hundreds number, thousands number, or ten-thousands number, then a problem with regrouping of the tens number, hundreds number, thousands number and ten-thousands number.

Discuss again the importance of being able to subtract to 100,000. As a closing activity have the students spin the spinner and solve the problems.

Have students that have difficulty with subtracting to 100,000 first practice subtracting to 10,000.

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Lesson

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