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2nd grade · Math · Unit 3 of 17

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.

Alabama Course of Study content standard: 2.1; 2.10 · adding and subtracting within 100 using place value, 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 Alabama

In the Alabama Course of Study, this is unit 3 of 17 in 2nd grade Math, after Facts to 20 and before Patterns.

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: Alabama State Department of Education (ALSDE)

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 55 + 26?

    55 + 26 = ?

    • 81
    • 78
    • 71

  2. Question 2

    What is 90 − 20?

    90 − 20 = ?

    • 71
    • 68
    • 70

  3. Question 3

    What is 25 + 10?

    25 + 10 = ?

    • 35
    • 36
    • 33

  4. Question 4

    Ollie has 39 shells. He finds 22 more. How many shells now?

    🐚39 + 22
    • 65
    • 66
    • 61

  5. Question 5

    What is 32 + 27?

    32 + 27 = ?

    • 64
    • 57
    • 59

  6. Question 6

    What is 25 + 20?

    25 + 20 = ?

    • 44
    • 45
    • 51

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