Common Core
2.NBT.B.7
10 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 2 Math · Chapter 4 · Lesson 3
Ten tens make a hundred, in the middle of a sum too.
Grade 2 Math · Chapter 5 · Lesson 1
Adding and Subtracting Hundreds
Whole hundreds behave like single digits.
Grade 2 Math · Chapter 5 · Lesson 2
Three columns now, same rule.
Grade 2 Math · Chapter 5 · Lesson 3
When the tens fill up, bundle them.
Grade 2 Math · Chapter 5 · Lesson 4
Take away each kind of block in turn.
Grade 2 Math · Chapter 5 · Lesson 5
Not enough tens? Open a hundred.
Grade 2 Math · Chapter 5 · Lesson 6
The hardest case, taken slowly.
Grade 2 Math · Chapter 5 · Lesson 8
Bigger numbers, same thinking.
Grade 2 Math · Chapter 5 · Lesson 9
Ones, then tens, then hundreds. A carry can happen twice.
Grade 2 Math · Chapter 5 · Lesson 10
Three Columns Down, Written Out
Borrow from the next column. Across a zero, keep going.