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1st grade · Math · Unit 4 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.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 1.5(C); 1.3(A) · 10 more and 10 less, and adding a multiple of 10 and a one-digit number

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 Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 4 of 16 in 1st grade Math, after Count It Up and before Make 10.

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: Texas Education Agency (TEA)

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 22 + 60?

    22 + 60 = ?

    • 72
    • 28
    • 82
    • 83

  2. Question 2

    What is 10 less than 67?

    • 66
    • 77
    • 58
    • 57

  3. Question 3

    What is 18 + 5?

    18 + 5 = ?

    • 22
    • 23
    • 33
    • 13

  4. Question 4

    What is 10 more than 65?

    • 76
    • 75
    • 165
    • 55

  5. Question 5

    What is 30 − 20?

    30 − 20 = ?

    • 1
    • 40
    • 10
    • 20

  6. Question 6

    What is 35 + 8?

    35 + 8 = ?

    • 53
    • 43
    • 42
    • 33

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