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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.

Minnesota K-12 Academic Standards benchmark: 1.3.5.7; 1.3.5.10 · adding within 100 with tens and ones, and using combinations of 10 to reach the next ten

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 Minnesota

In the Minnesota K-12 Academic Standards, this is unit 13 of 14 in 1st grade Math, after Coins & Cents 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: 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 60 − 20?

    60 − 20 = ?

    • 70
    • 4
    • 30
    • 40

  2. Question 2

    What is 10 less than 37?

    • 27
    • 36
    • 28
    • 47

  3. Question 3

    What is 12 + 60?

    12 + 60 = ?

    • 73
    • 18
    • 72
    • 62

  4. Question 4

    What is 10 more than 28?

    • 39
    • 38
    • 18
    • 29

  5. Question 5

    What is 34 + 6?

    34 + 6 = ?

    • 50
    • 39
    • 30
    • 40

  6. Question 6

    What is 70 − 60?

    70 − 60 = ?

    • 30
    • 40
    • 1
    • 10

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