Adding and subtracting within 100 worksheets
Aligned with Common Core 2.NBT.B.5
Printable second-grade worksheets for two-digit addition and subtraction: base-ten blocks, open number lines, then graph-paper problems without and with regrouping, and a mixed plus-or-minus page.
The worksheets
- See it all
Carry and Regroup Chart
One worked example of carrying in addition and one of regrouping in subtraction, step by step.
Add with Base-Ten Blocks
Two-digit addition shown with ten rods and one cubes, so kids can see a new ten being made.
Jump on a Number Line
Add a two-digit number by jumping the tens, then the ones, on an open number line.
Add Two-Digit Numbers
Two-digit addition on graph paper where the ones never add up to 10 or more.
Add with Regrouping
Two-digit addition on graph paper where every problem needs a carried ten.
Subtract Two-Digit Numbers
Two-digit subtraction on graph paper where the top ones digit is always big enough.
Subtract with Regrouping
Two-digit subtraction on graph paper where every problem needs regrouping, with a row on top for the new numbers.
Add or Subtract?
Two-digit addition and subtraction mixed on one page, some with regrouping and some without.
Print the whole packet
One copy of every sheet above, in order. Tap + for more copies (up to 10).
For the parent or teacher
What it is
Adding and subtracting two-digit numbers, like 47 + 25 and 63 - 28. The ones are added or subtracted first, then the tens. When the ones add up to 10 or more, 10 of them become 1 ten (carrying). When there aren't enough ones to take away, 1 ten becomes 10 ones (regrouping). Every problem in this topic uses two-digit numbers on both lines.
What comes next
Place value to 1,000, then adding and subtracting three-digit numbers.
How to teach it
- Start with blocks. Let kids trade 10 loose ones for a ten rod before they ever see the word "carry".
- Use the open number line to add in your head. Jump the tens first, then the ones.
- On graph paper, always start in the ones column, on the right.
- Do problems without regrouping first, then with regrouping, then the mixed page.
Common mistakes
- Writing 12 in the ones place instead of carrying the 1 ten.
- Subtracting the smaller digit from the bigger one in the ones (63 - 28 becomes 45).
- Forgetting to take 1 away from the tens after regrouping.
- Adding when the sign says subtract on the mixed page.