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2nd grade · Math · Unit 3 of 16

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.

Alaska content standards learning standard: 2.NBT.5; 2.OA.1 · 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 Alaska

In the Alaska content standards, this is unit 3 of 16 in 2nd grade Math, after Facts to 20 and before Measuring.

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: Alaska Department of Education and Early Development

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 64 + 21?

    • 83
    • 89
    • 85

  2. Question 2

    What is 72 − 50?

    72 − 50 = ?

    • 22
    • 16
    • 32

  3. Question 3

    What is 86 − 11?

    86 − 11 = ?

    • 70
    • 71
    • 75

  4. Question 4

    Ollie has 18 stickers. He gets 12 more. How many stickers now?

    ⭐18 + 12
    • 30
    • 36
    • 20

  5. Question 5

    What is 26 + 20?

    26 + 20 = ?

    • 48
    • 46
    • 51

  6. Question 6

    What is 27 + 63?

    27 + 63 = ?

    • 94
    • 96
    • 90

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