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3rd grade · Math · Unit 8 of 14

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.

Arizona Academic Standards learning standard: 3.NBT.A.1 · rounding whole numbers within 1000 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 Arizona

In the Arizona Academic Standards, this is unit 8 of 14 in 3rd grade Math, after Time 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: 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

    Round 187 to the nearest ten.

    180181182183184185186187188189190
    • 180
    • 200
    • 190

  2. Question 2

    Count back by 100s. What comes next?

    700, 600, 500, 400,

    • 302
    • 300
    • 306

  3. Question 3

    Round 811 to the nearest hundred.

    • 810
    • 900
    • 800

  4. Question 4

    Round 308 to the nearest ten.

    300301302303304305306307308309310
    • 308
    • 310
    • 300

  5. Question 5

    Tap the numbers from smallest to biggest.

    • 884
    • 579
    • 446
    • 795

  6. Question 6

    Round 283 to the nearest hundred.

    • 200
    • 280
    • 300

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