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Section 26.3 Deliberate Practice: Subtraction Practice

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Algebra is a skill, which means it requires practice to become proficient. But it will take more than rote repetition to get there. Deliberate practice is the thoughtful repetition of a task. For each of these sections, you will be given a list of specific skills or ideas to focus on as you practice thinking through the problems.

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Focus on these skills:

  • Do the problem mentally before drawing any part of the number line diagram.

  • Draw out the steps of subtracting the different place values on the number line diagram.

  • Present your work legibly.

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Worksheet Worksheet
A4US

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Instructions: Perform the given calculation mentally, then draw out a number line diagram to perform the calculation.

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1.

Calculate 48−23 mentally and on a number line.

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2.

Calculate 75−38 mentally and on a number line.

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3.

Calculate 62−15 mentally and on a number line.

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4.

Calculate 53−47 mentally and on a number line.

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5.

Calculate 61−28 mentally and on a number line.

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6.

Calculate 83−71 mentally and on a number line.

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7.

Calculate 48−29 mentally and on a number line.

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8.

Calculate 378−227 mentally and on a number line.

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9.

Calculate 283−149 mentally and on a number line.

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10.

Calculate 314−178 mentally and on a number line.