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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.

Alaska content standards learning standard: 3.NBT.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 Alaska

In the Alaska content 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: Alaska Department of Education and Early Development

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 149 + 15?

    149 + 15 = ?

    • 174
    • 264
    • 164
    • 154

  2. Question 2

    About how much is 593 + 206?

    • 900
    • 1000
    • 700
    • 800

  3. Question 3

    What is 273 + 210? Use the jumps.

    200300400500
    • 473
    • 583
    • 483
    • 493

  4. Question 4

    What is 593 − 227?

    593 − 227 = ?

    answer box

  5. Question 5

    What is 217 + 15?

    217 + 15 = ?

    answer box

  6. Question 6

    What is 396 − 288?

    396 − 288 = ?

    • 112
    • 98
    • 118
    • 108

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