➕ 2nd Grade Math · Unit 4

Adding and Subtracting Within 1,000

8 short narrated lessons in 2 chapters, each with pictures, a quiz with a hint and a second try, and an explanation for every answer.

Standards: 2.NBT.B.7 2.NBT.B.9

2nd Grade Math · 9 units
  1. 1Addition and Subtraction Fluency
  2. 2Place Value to 1,000
  3. 3Adding and Subtracting Within 100
  4. 4Adding and Subtracting Within 1,000
  5. 5Measuring Length
  6. 6Time and Money
  7. 7Data and Graphs
  8. 8Getting Ready to Multiply
  9. 9Shapes and Fractions
Picture from the lesson “Adding Hundreds”
Adding Hundreds
Picture from the lesson “Adding Three-Digit Numbers”
Adding Three-Digit Numbers
Picture from the lesson “Regrouping to Add”
Regrouping to Add

What your child will learn

Adding within 1,000

  1. Adding HundredsAdd hundreds to hundreds, like 300 plus 400.
  2. Adding Three-Digit NumbersAdd three-digit numbers by adding hundreds, tens and ones.
  3. Regrouping to AddAdd three-digit numbers by making a new ten or a new hundred.
  4. Adding Big Numbers Review ReviewReview adding three-digit numbers with models and regrouping.

Subtracting within 1,000

  1. Subtracting HundredsSubtract hundreds from hundreds, like 700 minus 200.
  2. Subtracting Three-Digit NumbersSubtract three-digit numbers by subtracting hundreds, tens and ones.
  3. Regrouping to SubtractSubtract three-digit numbers by breaking a ten or a hundred.
  4. Subtracting Within 1,000 Review ReviewReview subtracting three-digit numbers with models and regrouping.

Try a question from this unit

From the lesson “Adding Hundreds”

One yellow hundred flat labeled 100, a plus sign, and four hundred flats labeled 400.

What is 100 + 400?

  • [object Object]
  • [object Object]
  • [object Object]
Show the answer

[object Object]. 1 hundred and 4 hundreds make 5 hundreds, and 5 hundreds is 500.

Hint kids see after a wrong try: “Count all the flat squares together, by hundreds.”

Key words

  • hundreds
  • place value
  • regroup
  • subtract
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