Common Core
3.NBT.A.2
4 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 3 Math · Chapter 2 · Lesson 4
Faster now, with the blocks in your head.
Grade 3 Math · Chapter 2 · Lesson 5
Subtracting Within 1,000 Fluently
Break a unit open when you need to.
Grade 3 Math · Chapter 2 · Lesson 10
Ones first. The carry goes small, above the next column.
Grade 3 Math · Chapter 2 · Lesson 11
Column Subtraction, Written Out
Not enough on top? Borrow from the next column.