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1st grade · Math · Unit 13 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.

New York State Learning Standards learning standard: NY-1.NBT.4; NY-1.NBT.5; NY-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 New York

In the New York State Learning Standards, this is unit 13 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: New York State Education Department (NYSED)

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 10 less than 97?

    • 86
    • 96
    • 107
    • 87

  2. Question 2

    What is 80 − 70?

    80 − 70 = ?

    • 40
    • 0
    • 1
    • 10

  3. Question 3

    What is 10 more than 37?

    • 27
    • 137
    • 48
    • 47

  4. Question 4

    What is 53 + 9?

    53 + 9 = ?

    • 52
    • 72
    • 61
    • 62

  5. Question 5

    What is 30 + 30?

    30 + 30 = ?

    • 33
    • 50
    • 61
    • 60

  6. Question 6

    What is 87 + 9?

    87 + 9 = ?

    • 95
    • 96
    • 106
    • 86

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