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3rd grade · Math · Unit 9 of 16

Round & Count

Round, count and compare to 1000

What your child practices

Rounding numbers to the nearest ten or hundred, counting forward and back by 50s, 100s and 200s, and comparing and ordering numbers up to 1000.

New York State Learning Standards learning standard: NY-3.NBT.1 · rounding whole numbers to the nearest 10 or 100

How we explain it

Children can open this short lesson before they practice.

  1. To round to the nearest ten, look at the ones digit.
  2. If the ones digit is 5 or more, round up. If less than 5, round down.
  3. Skip count forward or back by 10s, 50s or 100s.

Example: Round 166 to the nearest ten. The ones digit is 6, which is 5 or more. Round up: 170. Answer: 170

Round & Count in New York

In the New York State Learning Standards, this is unit 9 of 16 in 3rd grade Math, after Numbers to 10,000 and before Area & Perimeter.

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 number is missing?

    300, , 500, 600, 700

    • 390
    • 394
    • 400

  2. Question 2

    Round 723 to the nearest ten.

    720721722723724725726727728729730
    • 700
    • 730
    • 720

  3. Question 3

    Round 807 to the nearest ten.

    800801802803804805806807808809810
    • 807
    • 800
    • 810

  4. Question 4

    Tap the numbers from smallest to biggest.

    • 118
    • 441
    • 911
    • 271

  5. Question 5

    Round 349 to the nearest hundred.

    • 350
    • 400
    • 300

  6. Question 6

    Round 432 to the nearest hundred.

    • 430
    • 500
    • 400

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