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3rd grade · Math · Unit 1 of 14

Add & Subtract

Bigger numbers to 1000

What your child practices

Adding and subtracting 2- and 3-digit numbers by place value, number-line jumps and counting up, plus estimating by rounding to the nearest hundred.

Arizona Academic Standards learning standard: 3.NBT.A.2 · fluently adding and subtracting within 1000

How we explain it

Children can open this short lesson before they practice.

  1. Line up the ones, tens and hundreds.
  2. Start with the ones, then tens, then hundreds.
  3. If a place goes over 9 when adding, regroup to the next place.

Example: 276 + 148 = ? Ones: 6 + 8 = 14. Write 4 and regroup 1 ten. Tens: 7 + 4 + 1 = 12. Write 2 and regroup 1 hundred. Hundreds: 2 + 1 + 1 = 4. Answer: 424

Add & Subtract in Arizona

In the Arizona Academic Standards, this is unit 1 of 14 in 3rd grade Math, before Multiplication.

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

    What is 460 − 12?

    460 − 12 = ?

    • 438
    • 452
    • 458
    • 448

  2. Question 2

    What is 243 − 226?

    243 − 226 = ?

    answer box

  3. Question 3

    What is 306 + 45?

    306 + 45 = ?

    answer box

  4. Question 4

    A theater has 330 seats downstairs and 82 seats upstairs. How many seats are there in all?

    🎭

    answer box

  5. Question 5

    Zoe's book has 656 pages. Zoe has read 66 pages. How many pages are left to read?

    📖
    • 722
    • 610
    • 600
    • 590

  6. Question 6

    About how much is 92 + 309?

    • 500
    • 600
    • 300
    • 400

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