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2nd grade · Math · Unit 3 of 14

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.

Minnesota K-12 Academic Standards benchmark: 2.3.5.7; 2.3.5.9 · adding and subtracting two-digit numbers with place value strategies

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 Minnesota

In the Minnesota K-12 Academic Standards, this is unit 3 of 14 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: Minnesota Department of Education (MDE)

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 84 − 20?

    84 − 20 = ?

    • 63
    • 64
    • 54

  2. Question 2

    What is 11 + 20?

    11 + 20 = ?

    • 28
    • 31
    • 26

  3. Question 3

    What is 31 + 20?

    31 + 20 = ?

    • 56
    • 47
    • 51

  4. Question 4

    What is 62 + 21?

    62 + 21 = ?

    • 87
    • 82
    • 83

  5. Question 5

    What is 28 + 37?

    28 + 37 = ?

    • 65
    • 69
    • 71

  6. Question 6

    What is 75 − 12?

    75 − 12 = ?

    • 69
    • 63
    • 66

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