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1st grade · Math · Unit 13 of 14

Jump by Tens

10 more, 10 less

What your child practices

Finding 10 more and 10 less than a number in their head, subtracting tens, and adding ones or tens to a two-digit number.

Arizona Academic Standards learning standard: 1.NBT.C.4; 1.NBT.C.5; 1.NBT.C.6 · finding 10 more and 10 less, subtracting multiples of 10, and adding within 100

How we explain it

Children can open this short lesson before they practice.

  1. 10 more: the tens digit goes up 1.
  2. 10 less: the tens digit goes down 1.
  3. The ones digit stays the same.

Example: What is 10 more than 47? 4 tens become 5 tens. The 7 ones stay. Answer: 57

Jump by Tens in Arizona

In the Arizona Academic Standards, this is unit 13 of 14 in 1st grade Math, after Hour & Half Hour and before Picture Graphs.

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

    What is 47 + 50?

    47 + 50 = ?

    • 87
    • 97
    • 52
    • 98

  2. Question 2

    What is 10 less than 39?

    • 29
    • 30
    • 49
    • 28

  3. Question 3

    What is 10 more than 56?

    • 67
    • 66
    • 57
    • 156

  4. Question 4

    What is 14 + 7?

    14 + 7 = ?

    • 20
    • 11
    • 31
    • 21

  5. Question 5

    What is 60 − 10?

    60 − 10 = ?

    • 40
    • 50
    • 5
    • 60

  6. Question 6

    What is 10 less than 69?

    • 58
    • 79
    • 59
    • 68

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