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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.

California 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

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 80 − 20?

    80 − 20 = ?

    • 50
    • 60
    • 70
    • 6

  2. Question 2

    What is 10 less than 41?

    • 31
    • 30
    • 51
    • 40

  3. Question 3

    What is 23 + 10?

    23 + 10 = ?

    • 34
    • 33
    • 24
    • 23

  4. Question 4

    What is 10 more than 58?

    • 158
    • 69
    • 68
    • 48

  5. Question 5

    What is 29 + 8?

    29 + 8 = ?

    • 37
    • 36
    • 27
    • 47

  6. Question 6

    What is 10 less than 86?

    • 77
    • 96
    • 75
    • 76

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