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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.

Alabama Course of Study content standard: 3.11 · 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 Alabama

In the Alabama Course of Study, 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: Alabama State Department of Education (ALSDE)

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

    A school library has 717 books. It gets 69 new books. How many books does it have now?

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    answer box

  2. Question 2

    A tree farm had 485 trees. It sold 269 trees. How many trees are left?

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    • 224
    • 754
    • 216
    • 226

  3. Question 3

    About how much is 203 + 408?

    • 600
    • 700
    • 500
    • 800

  4. Question 4

    What is 467 + 140?

    467 + 140 = ?

    • 507
    • 607
    • 617
    • 597

  5. Question 5

    What is 255 − 84?

    255 − 84 = ?

    • 181
    • 231
    • 171
    • 161

  6. Question 6

    What is 739 − 68?

    739 − 68 = ?

    answer box

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