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3rd grade · Math · Unit 10 of 12

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.

Minnesota K-12 Academic Standards benchmark: 3.3.5.8 · multiplying one-digit numbers by multiples of 10

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 Minnesota

In the Minnesota K-12 Academic Standards, this is unit 10 of 12 in 3rd grade Math, after Sorting Polygons and before Halves & Fourths of an Inch.

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: Minnesota Department of Education (MDE)

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

    7 × ? = 560. What number is missing?

    • 110
    • 60
    • 800
    • 80
    • 100

  2. Question 2

    What is 3 × 40?

    3 × 40 = ?

    • 43
    • 1200
    • 12
    • 120

  3. Question 3

    8 × 3 = 24. So what is 8 × 30?

    • 24
    • 240
    • 34
    • 230
    • 2400

  4. Question 4

    There are 9 trays with 50 beads in each. How many beads are there?

    • 450
    • 480
    • 59
    • 4500
    • 45

  5. Question 5

    What is 3 × 70?

    3 × 70 = ?

    • 21
    • 2100
    • 210
    • 73

  6. Question 6

    There are 3 boxes with 90 crayons in each. How many crayons are there?

    • 300
    • 270
    • 2700
    • 93
    • 27

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