Addition & subtraction Math Practice

About this grouping

Begin with quantities you can represent and explain. The later topics extend the available fact ranges and place-value changes; this grouping is not a full arithmetic curriculum.

Choose what to practice

Each Start opens that topic’s available practice. This grouping does not launch a combined session or enroll you in a course.

• Addition within 10

  Add numbers with a total up to 10.

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• Subtraction within 10

  Subtract from numbers up to 10. Answers are zero or greater.

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• Complements to 10

  Find the missing part that makes 10.

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• Tens and ones

  Read digit values and build two-digit numbers.

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• Addition from 11 to 20

  Add numbers with a total from 11 to 20.

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• Subtraction from 11 to 20

  Subtract from numbers from 11 to 20. Answers are zero or greater.

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• Missing numbers within 20

  Find a missing number in addition or subtraction within 20.

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• Ten more or less

  Find 10 more or less than a two-digit number, with answers from 0 to 99.

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• Mental addition within 100

  Totals up to 100: whole tens, no regrouping, and crossing one ten with a single digit.

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• Mental subtraction within 100

  Subtract within 100: whole tens, no regrouping, and crossing one ten with a single digit.

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• Hundreds tens and ones

  Read digit values and build three-digit numbers, including zeros.

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• Ten or hundred more or less

  Find 10 or 100 more or less than numbers from 100 to 900.

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• Mental complements

  Finding the amount needed to reach a nearby friendly number.

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• Rounding whole numbers

  Round numbers from 0 to 999 to the nearest ten or hundred. Halfway values round up.

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