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3rd grade · Math · Unit 12 of 16

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.

New York State Learning Standards learning standard: NY-3.NBT.3 · multiplying one-digit 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 New York

In the New York State Learning Standards, this is unit 12 of 16 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: 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

    8 × ? = 640. What number is missing?

    • 800
    • 70
    • 80
    • 110
    • 50

  2. Question 2

    There are 2 boxes with 60 crayons in each. How many crayons are there?

    • 150
    • 12
    • 62
    • 120
    • 1200

  3. Question 3

    What is 9 × 70?

    9 × 70 = ?

    • 6300
    • 63
    • 630
    • 79

  4. Question 4

    5 × 5 = 25. So what is 5 × 50?

    • 220
    • 250
    • 25
    • 35
    • 2500

  5. Question 5

    There are 4 boxes with 90 crayons in each. How many crayons are there?

    • 94
    • 36
    • 360
    • 330
    • 3600

  6. Question 6

    9 × ? = 270. What number is missing?

    • 300
    • 20
    • 10
    • 30
    • 60

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