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1st grade · Math · Unit 14 of 16

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.

Alabama Course of Study content standard: 1.13; 1.14; 1.15 · adding within 100, finding 10 more and 10 less, and subtracting multiples of 10

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 Alabama

In the Alabama Course of Study, this is unit 14 of 16 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: Alabama State Department of Education (ALSDE)

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 70 − 30?

    70 − 30 = ?

    • 10
    • 70
    • 40
    • 4

  2. Question 2

    What is 19 + 1?

    19 + 1 = ?

    • 20
    • 10
    • 19
    • 30

  3. Question 3

    What is 10 less than 34?

    • 23
    • 25
    • 33
    • 24

  4. Question 4

    What is 10 more than 21?

    • 121
    • 31
    • 32
    • 22

  5. Question 5

    What is 26 + 70?

    26 + 70 = ?

    • 97
    • 96
    • 33
    • 86

  6. Question 6

    What is 10 more than 28?

    • 38
    • 29
    • 18
    • 39

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