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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.

Arizona Academic Standards learning standard: 2.NBT.B.5; 2.OA.A.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 Arizona

In the Arizona Academic 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: Arizona Department of Education

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

    Ollie has 25 shells. He finds 34 more. How many shells now?

    🐚25 + 34
    • 59
    • 69
    • 58

  2. Question 2

    What is 64 − 20?

    64 − 20 = ?

    • 44
    • 38
    • 41

  3. Question 3

    What is 22 + 55?

    • 77
    • 82
    • 81

  4. Question 4

    What is 57 − 21?

    57 − 21 = ?

    • 33
    • 35
    • 36

  5. Question 5

    What is 41 + 34?

    41 + 34 = ?

    • 85
    • 69
    • 75

  6. Question 6

    What is 14 + 10?

    14 + 10 = ?

    • 26
    • 24
    • 25

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