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2nd grade · Math · Unit 7 of 19

Add & Subtract to 1000

Hundreds, tens and ones

What your child practices

Adding and subtracting three-digit numbers using place value, and adding or taking away 10 or 100 in their head.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 2.4(C); 2.7(B) · adding and subtracting within 1,000, and finding 10 or 100 more or less

How we explain it

Children can open this short lesson before they practice.

  1. Add the hundreds, then the tens, then the ones.
  2. Regroup 10 ones as a ten, or 10 tens as a hundred.
  3. 10 more or 100 more changes just one digit.

Example: What is 345 + 132? 300 + 100 = 400. 40 + 30 = 70. 5 + 2 = 7. 400 + 70 + 7 = 477. Answer: 477

Add & Subtract to 1000 in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 7 of 19 in 2nd grade Math, after Adding to 100 and before Balance It.

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 970 − 104?

    970 − 104 = ?

    • 966
    • 866
    • 867
    • 856
    • 876

  2. Question 2

    What is 800 + 40 + 2?

    800 + 40 + 2 = ?

    • 824
    • 942
    • 14
    • 842

  3. Question 3

    290 + ? = 390. What number is missing?

    • 110
    • 100
    • 10
    • 200

  4. Question 4

    What is 374 + 390?

    374 + 390 = ?

    • 864
    • 754
    • 664
    • 764
    • 774

  5. Question 5

    What is 100 more than 620?

    • 719
    • 630
    • 720
    • 721
    • 621

  6. Question 6

    What is 555 − 218?

    555 − 218 = ?

    • 337
    • 437
    • 339
    • 347
    • 327

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