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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.

Alaska content standards learning standard: 1.NBT.4; 1.NBT.5; 1.NBT.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 Alaska

In the Alaska content 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: 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 12 + 40?

    12 + 40 = ?

    • 42
    • 53
    • 52
    • 16

  2. Question 2

    What is 10 more than 37?

    • 38
    • 137
    • 48
    • 47

  3. Question 3

    What is 10 less than 44?

    • 54
    • 33
    • 35
    • 34

  4. Question 4

    What is 90 − 60?

    90 − 60 = ?

    • 60
    • 3
    • 30
    • 50

  5. Question 5

    What is 86 + 4?

    86 + 4 = ?

    • 100
    • 89
    • 80
    • 90

  6. Question 6

    What is 31 + 50?

    31 + 50 = ?

    • 81
    • 36
    • 71
    • 82

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