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3rd grade · Math · Unit 1 of 12

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.

Minnesota K-12 Academic Standards benchmark: 3.3.5.5 · adding and subtracting within 1000 with place value strategies

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 Minnesota

In the Minnesota K-12 Academic Standards, this is unit 1 of 12 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: Minnesota Department of Education (MDE)

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 760 − 230? Use the jumps.

    500600700800
    • 530
    • 520
    • 630
    • 540

  2. Question 2

    What is 515 + 66?

    515 + 66 = ?

    answer box

  3. Question 3

    Sofia's book has 634 pages. Sofia has read 451 pages. How many pages are left to read?

    📖
    • 223
    • 183
    • 173
    • 193

  4. Question 4

    About how much is 303 + 410?

    • 600
    • 800
    • 700
    • 900

  5. Question 5

    What is 312 − 172?

    312 − 172 = ?

    answer box

  6. Question 6

    What is 892 − 79?

    892 − 79 = ?

    • 823
    • 813
    • 827
    • 803

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