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3rd grade · Math · Unit 11 of 14

Times Tens

Multiply by 10, 20, 30 ...

What your child practices

Multiplying a one-digit number by a multiple of ten (like 6 × 40) using a basic fact and place value.

Arizona Academic Standards learning standard: 3.NBT.A.3 · multiplying one-digit whole numbers by multiples of 10 from 10 to 90

How we explain it

Children can open this short lesson before they practice.

  1. Use the basic fact first.
  2. Then multiply by 10: the answer is that many tens.
  3. 6 × 40 is 6 × 4 tens.

Example: What is 6 × 40? 6 × 4 = 24. 24 tens = 240. Answer: 240

Times Tens in Arizona

In the Arizona Academic Standards, this is unit 11 of 14 in 3rd grade Math, after Sorting Polygons and before Two-Step Stories.

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: Arizona Department of Education

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

    5 × 2 = 10. So what is 5 × 20?

    • 90
    • 1000
    • 100
    • 20
    • 10

  2. Question 2

    What is 8 × 60?

    8 × 60 = ?

    • 68
    • 480
    • 4800
    • 48

  3. Question 3

    2 × ? = 80. What number is missing?

    • 50
    • 400
    • 70
    • 40
    • 30

  4. Question 4

    There are 8 shelves with 60 books in each. How many books are there?

    • 4800
    • 480
    • 48
    • 460
    • 68

  5. Question 5

    9 × 9 = 81. So what is 9 × 90?

    • 81
    • 810
    • 780
    • 91
    • 8100

  6. Question 6

    What is 5 × 10?

    5 × 10 = ?

    • 50
    • 5
    • 500
    • 15

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