➕ 3rd Grade Math · Unit 3

Adding and Subtracting within 1,000

19 short narrated lessons in 4 chapters, each with pictures, a quiz with a hint and a second try, and an explanation for every answer.

Standards: 3.NBT.A.1 3.NBT.A.2 3.OA.D.8

3rd Grade Math · 7 units
  1. 1Introducing Multiplication
  2. 2Area and Multiplication
  3. 3Adding and Subtracting within 1,000
  4. 4Multiplication and Division
  5. 5Fractions
  6. 6Measurement and Data
  7. 7Shapes and Perimeter
Picture from the lesson “Hundreds, Tens and Ones”
Hundreds, Tens and Ones
Picture from the lesson “Rounding to the Nearest Ten”
Rounding to the Nearest Ten
Picture from the lesson “Rounding to the Nearest Hundred”
Rounding to the Nearest Hundred

What your child will learn

Place value and rounding

  1. Hundreds, Tens and OnesRead and write three-digit numbers and tell the value of each digit.
  2. Rounding to the Nearest TenRound numbers to the nearest ten using a number line.
  3. Rounding to the Nearest HundredRound numbers to the nearest hundred using a number line.
  4. Estimating Sums and DifferencesUse rounding to estimate answers before adding or subtracting.
  5. Place Value and Rounding Review ReviewReview place value and rounding to the nearest ten and hundred.

Adding within 1,000

  1. Adding with Place ValueAdd three-digit numbers by adding hundreds, tens and ones.
  2. Adding with RegroupingAdd three-digit numbers when a place has 10 or more and needs regrouping.
  3. Adding Three NumbersAdd three numbers using place value and friendly groupings.
  4. Adding Within 1,000 Review ReviewReview adding three-digit numbers with and without regrouping.

Subtracting within 1,000

  1. Subtracting with Place ValueSubtract three-digit numbers by subtracting hundreds, tens and ones.
  2. Subtracting with RegroupingSubtract when a place does not have enough, by regrouping from the next place.
  3. Subtracting Across ZerosSubtract from numbers with zeros, like 400 minus 158.
  4. Checking Subtraction with AdditionCheck a subtraction answer by adding.
  5. Subtracting Within 1,000 Review ReviewReview subtracting three-digit numbers and checking answers.

Two-step problems

  1. Solving Two-Step Word ProblemsSolve word problems that take two steps, using any of the four operations.
  2. Using a Letter for the UnknownWrite an equation with a letter standing for the unknown number.
  3. Is My Answer Reasonable?Use estimation and mental math to check if an answer makes sense.
  4. Two-Step Problems Review ReviewReview solving and checking two-step word problems.
  5. Unit 3 Test: Adding and Subtracting within 1,000Show what you learned in the whole unit (Place value and rounding, Adding within 1,000, Subtracting within 1,000, Two-step problems) by answering mixed questions.

Try a question from this unit

From the lesson “Hundreds, Tens and Ones”

In 583, what is the value of the 8?

  • 8
  • 80
  • 800
  • 83
Show the answer

80. The 8 is in the tens place, so it means 8 tens, which is 80.

Hint kids see after a wrong try: “Which place is the 8 in?”

Key words

  • place value
  • digit
  • hundreds
  • round
  • nearest ten
  • nearest hundred
  • estimate
  • sum
  • add
  • regroup
  • associative property
  • difference
  • subtract
  • zero
  • check
  • two-step
  • unknown
  • equation
  • reasonable
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