Subscribe

2nd grade · Math · Unit 5 of 19

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.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 2.4(A) · recalling addition and subtraction facts within 20

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

Facts to 20 in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 5 of 19 in 2nd grade Math, after Even, Odd and Ordinals and before Adding to 100.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Texas Education Agency (TEA)

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 − 3?

    14 − 3 = ?

    • 10
    • 11
    • 15

  2. Question 2

    What number is missing?

    7 + = 13

    • 1
    • 11
    • 6

  3. Question 3

    What is 18 − 9?

    18 − 9 = ?

    • 12
    • 10
    • 9

  4. Question 4

    What is 9 + 6?

    • 15
    • 5
    • 14

  5. Question 5

    What is 19 − 8?

    19 − 8 = ?

    • 17
    • 1
    • 11

  6. Question 6

    What is 8 + 5?

    8 + 5 = ?

    • 16
    • 15
    • 13

More 2nd grade