Grade 1 · Math · Place value operations

1st Grade Two-Digit Addition worksheets

6 printable versionsChallenge MeAbout 4 minutes eachFree · no account

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Two-Digit Addition

Grade 1 Math Worksheet - Challenge Me

NameDate

Write the sum on the line.

64 + 3 =
24 + 20 =
52 + 5 =
72 + 20 =
43 + 2 =
56 + 40 =
72 + 6 =
78 + 20 =
12 + 60 =
23 + 60 =
39 + 40 =
35 + 10 =
71 + 4 =
42 + 30 =
69 + 30 =
23 + 10 =

1st Grade Two-Digit Addition worksheet 1 – printable PDF — Download PDF: 1 2 3 4 5 6

About this worksheet

Adding within 100 in first grade means adding a two-digit number and a one-digit number, or adding tens, without carrying: 30 + 4, 40 + 30 or 23 + 5. The skill is seeing that the tens and the ones can be added on their own: 23 + 5 leaves the 2 tens alone and adds 3 + 5 = 8 ones. This worksheet is a clean page of addition sentences in one shape: two numbers, a plus sign and a line for the sum.

Support sheets add a ten and a one, such as 30 + 4, and whole tens, such as 40 + 30. Standard sheets add a one-digit number to a two-digit number. Challenge sheets add tens to a two-digit number, such as 34 + 20. None of the sums needs carrying.

What your child will learn

Add tens and ones without carrying
Add whole tens
Add a one-digit number to a two-digit number
Add tens to a two-digit number

Common Core standard: 1.NBT.C.4

Worked example

23 + 5: the 2 tens stay. 3 ones and 5 ones make 8 ones. So 23 + 5 = 28. Write 28.

Common mistake

Adding the ones to the tens digit, so writing 73 for 23 + 5.

Helpful hint

Add the tens and the ones separately, then put them together.

Next skill: Ten More and Ten Less Earlier: True and False Equations

Questions parents ask

What is the most common mistake with two-digit addition?

Adding the ones to the tens digit, so writing 73 for 23 + 5.

How can I help my child with two-digit addition?

Add the tens and the ones separately, then put them together.

Are these 1st grade math worksheets free to print?

Yes. All 6 printable versions on this page are free to download and print, with no account needed.

More 1st grade place value operations

See all place value operations

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