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2nd grade · Math · Unit 5 of 16

Facts to 20

Add and take away

What your child practices

Fluent facts to 20 using strategies like making ten and thinking addition to subtract.

Washington State Learning Standards learning standard: M.2.R.OA.2 · adding and subtracting within 20 using mental strategies

How we explain it

Children can open this short lesson before they practice.

  1. Use 10 as a stepping stone.
  2. Break one number to make a 10 with the other.
  3. Then add what is left over.

Example: 8 + 5 = ? 8 needs 2 more to make 10. Take 2 from 5. That leaves 3. 10 + 3 = 13. Answer: 13

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    What is 14 − 9?

    14 − 9 = ?

    • 5
    • 0
    • 11

  2. Question 2

    What is 9 − 5?

    9 − 5 = ?

    • 1
    • 4
    • 3

  3. Question 3

    What is 5 + 2?

    • 5
    • 7
    • 8

  4. Question 4

    What number is missing?

    4 + = 16

    • 18
    • 12
    • 10

  5. Question 5

    What is 8 + 9?

    8 + 9 = ?

    • 18
    • 20
    • 17

  6. Question 6

    What is 5 + 4?

    5 + 4 = ?

    • 12
    • 9
    • 11

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