Subscribe

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.

Maine Learning Results 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 Maine

In the Maine Learning Results, 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: Maine 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 158 + 39?

    158 + 39 = ?

    • 187
    • 207
    • 297
    • 197

  2. Question 2

    What is 399 + 280? Use the jumps.

    300400500600700
    • 679
    • 779
    • 669
    • 689

  3. Question 3

    What is 208 − 122?

    208 − 122 = ?

    answer box

  4. Question 4

    What is 290 − 87?

    290 − 87 = ?

    • 193
    • 203
    • 213
    • 217

  5. Question 5

    About how much is 208 + 390?

    • 500
    • 800
    • 700
    • 600

  6. Question 6

    A tree farm had 304 trees. It sold 233 trees. How many trees are left?

    🌲
    • 71
    • 131
    • 81
    • 537

More 3rd grade