10 printable sets · answer key on every set

Addition Within 100 Worksheets

CCSS 2.NBT.B.5
20 problems per set
Answer key included

What this skill is

Adding two-digit numbers where the ones do not carry — 34 + 25.

When it comes up: Early second grade.

The mistake to watch for

Misaligning the columns when copying from a horizontal problem, so 34 + 5 becomes 34 + 50.

How to help

Use graph paper or turn lined paper sideways. One digit per box keeps the columns honest.

Next: Addition with regrouping to 100.

A worked example

Try 34 + 25. Add the tens: 30 + 20 = 50. Add the ones: 4 + 5 = 9. Put them together: 50 + 9 = 59.

Words to know

add: To put numbers together to find how many in all.
sum: The answer you get when you add.
total: All of the things added together.
ten: The number 10, one more than nine.
digit: One of the ten number symbols 0 to 9. The number 47 has two digits.

Practice

Add.

Showing Set 1 · 20 problems

32 + 67 =
80 + 2 =
4 + 11 =
62 + 35 =
62 + 2 =
81 + 16 =
21 + 76 =
98 + 1 =
27 + 61 =
88 + 11 =
73 + 12 =
95 + 3 =
82 + 5 =
33 + 25 =
51 + 42 =
4 + 91 =
94 + 1 =
97 + 1 =
11 + 50 =
83 + 12 =

Download this set20 problems · answer key included PDF

Answer key

All 10 sets

Each set is a different list of 20 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made

Problems are generated for each set and checked against 2.NBT.B.5 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.