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2-Digit Addition Worksheets

17 free PDFsUS Letter or A4Answer key includedNo login

Add tens, add a one-digit number to a two-digit number with and without regrouping, add two two-digit numbers, and find 10 more and 10 less, with answer keys.

Download the 2-digit addition worksheets

Add tens

Add multiples of 10, then add tens to a two-digit number.

2-digit plus 1-digit

Add a one-digit number to a two-digit number in rows and stacked, without and then with regrouping.

  • Preview of the printable “2-Digit plus 1-Digit Addition, sheet A” worksheet: adding a one-digit number to a two-digit number without regroupingView all 2 pages

    2-Digit plus 1-Digit Addition, sheet A

    Adding a one-digit number to a two-digit number without regrouping

    Answer key on page 2

    US LetterPDFA4PDF

    2 pages82 KB

  • Preview of the printable “2-Digit plus 1-Digit Addition, sheet B” worksheet: adding a one-digit number to a two-digit number without regroupingView all 2 pages

    2-Digit plus 1-Digit Addition, sheet B

    Adding a one-digit number to a two-digit number without regrouping

    Answer key on page 2

    US LetterPDFA4PDF

    2 pages82 KB

  • Preview of the printable “2-Digit plus 1-Digit with Regrouping, sheet A” worksheet: adding a one-digit number to a two-digit number, making a new tenView all 2 pages

    2-Digit plus 1-Digit with Regrouping, sheet A

    Adding a one-digit number to a two-digit number, making a new ten

    Answer key on page 2

    US LetterPDFA4PDF

    2 pages50 KB

  • Preview of the printable “2-Digit plus 1-Digit with Regrouping, sheet B” worksheet: adding a one-digit number to a two-digit number, making a new tenView all 2 pages

    2-Digit plus 1-Digit with Regrouping, sheet B

    Adding a one-digit number to a two-digit number, making a new ten

    Answer key on page 2

    US LetterPDFA4PDF

    2 pages50 KB

2-digit plus 2-digit

Add two two-digit numbers in tens and ones columns, with no regrouping.

10 more and 10 less

Find 10 less and 10 more in a table, and 1 more, 1 less, 10 more and 10 less on 120 chart crosses.

Print at 100% (actual size) for the cleanest tracing lines.

About these 2-digit addition worksheets

First graders start adding bigger numbers by thinking in tens and ones: tens go with tens, and ones go with ones. These 2 digit addition worksheets follow that path, from adding whole tens to adding a one-digit number that makes a new ten.

Add tens pages practice 30 + 40 and 34 + 20, where the ones stay the same. The 2-digit plus 1-digit pages come in rows and in stacked form with tens and ones columns, first without regrouping and then with it (38 + 5, where the ones make a new ten). There are also 2-digit plus 2-digit pages with no regrouping, plus 10 more and 10 less tables and 120 chart crosses for finding 1 more, 1 less, 10 more and 10 less.

Every page has an answer key on page 2 and prints in black and white on US Letter or A4.

Standards

  • CCSS.MATH.CONTENT.1.NBT.B.2.CThe numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
  • CCSS.MATH.CONTENT.1.NBT.C.4Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
  • CCSS.MATH.CONTENT.1.NBT.C.5Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

How to use them

  1. Start with Add Tens. If your child knows 3 + 4 = 7, then 3 tens + 4 tens = 7 tens, or 70.
  2. Move to adding tens to a number: in 34 + 20, only the tens change.
  3. Use the stacked pages with the tens and ones headings. Always add the ones first.
  4. Save the regrouping page until your child is sure of the no-regrouping pages. Use base ten blocks or bundles of 10 sticks to show the new ten.
  5. Use 10 more and 10 less often. It is quick mental math and links to the 120 chart.

Teaching tips

  • Line up the digits: ones under ones, tens under tens. The dashed boxes on the stacked pages help.
  • When the ones add up to 10 or more, 10 ones make a new ten. Add it to the tens.
  • 10 more changes only the tens digit: 47, 57, 67. If your child counts on by ones to find 10 more, show the pattern on the 120 chart.
  • If a child writes 313 for 38 + 5, they wrote the ones total (13) after the tens. Go back to blocks and trade 10 ones for a ten.

Questions teachers and parents ask

Do 1st graders do 2 digit addition?

Yes. First graders add within 100, mostly a two-digit number plus a one-digit number or plus a multiple of 10, like 34 + 5 or 34 + 20. They also start to see that sometimes the ones make a new ten.

What does regrouping mean?

When the ones add up to 10 or more, 10 ones are traded for one ten. In 38 + 5, the ones make 13, so that is 1 ten and 3 ones, and the answer is 43.

Are there answer keys?

Yes. Every page has an answer key on page 2 of the PDF.