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3rd grade · Math · Unit 3 of 18

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.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 3.4(A) · adding and subtracting within 1,000 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 Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 3 of 18 in 3rd grade Math, after Round & Count and before Two-Step Stories.

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: Texas Education Agency (TEA)

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 246 + 239?

    246 + 239 = ?

    • 475
    • 485
    • 585
    • 495

  2. Question 2

    What is 477 + 82?

    477 + 82 = ?

    answer box

  3. Question 3

    What is 415 + 230? Use the jumps.

    400500600700
    • 745
    • 635
    • 645
    • 655

  4. Question 4

    A farm stand sold 470 apples on Saturday and 190 apples on Sunday. How many apples were sold in all?

    🍎

    answer box

  5. Question 5

    What is 780 − 554?

    780 − 554 = ?

    answer box

  6. Question 6

    A bakery made 990 muffins. It sold 147. How many muffins are left?

    🧁
    • 843
    • 853
    • 833
    • 857

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