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2nd grade · Math · Unit 6 of 19

Adding to 100

Bigger adding and take-aways

What your child practices

Two-digit adding and subtracting by working with tens and ones, including making a new ten.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 2.4(B); 2.4(C) · adding and subtracting two-digit numbers with place value strategies, including word problems

How we explain it

Children can open this short lesson before they practice.

  1. Add the tens first.
  2. Then add the ones.
  3. Put the two answers together. To take away, work the same way.

Example: 34 + 25 = ? Tens: 30 + 20 = 50. Ones: 4 + 5 = 9. 50 + 9 = 59. Answer: 59

Adding to 100 in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 6 of 19 in 2nd grade Math, after Facts to 20 and before Add & Subtract to 1000.

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 51 + 10?

    51 + 10 = ?

    • 61
    • 58
    • 60

  2. Question 2

    What is 97 − 10?

    97 − 10 = ?

    • 88
    • 87
    • 84

  3. Question 3

    What is 57 + 15?

    57 + 15 = ?

    • 77
    • 62
    • 72

  4. Question 4

    Ollie has 12 blueberries. He picks 20 more. How many blueberries now?

    🫐12 + 20
    • 27
    • 29
    • 32

  5. Question 5

    What is 44 + 40?

    • 84
    • 85
    • 80

  6. Question 6

    What is 37 + 20?

    37 + 20 = ?

    • 57
    • 58
    • 51

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