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Addition With Regrouping Worksheets

19 free PDFsUS Letter or A4Answer key includedNo login

2-digit addition with regrouping in columns, place value and number line strategies, adding three and four numbers, and find the mistake pages. Every page has a key.

Download the addition with regrouping worksheets

2-digit addition with regrouping

Add in columns with a box for the new ten, decide when to regroup, add sums that go past 100, and mixed practice in rows.

Add with place value strategies

Add the tens and the ones separately, jump by tens on an open number line, and check a sum with subtraction.

Add three and four numbers

Add three or four 2-digit numbers in a column. The new ten can be 1, 2 or 3 tens.

Find the mistake

Each problem is already worked. Is it right or wrong? Most wrong answers forgot the new ten.

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

About these addition with regrouping worksheets

Regrouping (some teachers say carrying) is the big new step in 2nd grade addition. When the ones add up to 10 or more, the child trades 10 ones for 1 ten and writes it at the top of the tens column. These worksheets teach that step slowly, then mix it with problems that do not need it, so children learn to decide.

The column pages have a small box over the tens for the new ten, tens and ones headings, and a box for each digit of the answer, so the work stays lined up. Strategy pages show the same sums a second way: adding tens and ones separately, and jumping on an open number line. Later pages add three and four 2-digit numbers and cross into the hundreds.

Most pages come as Sheet A, B and C with new problems at the same level. Every page has an answer key on page 2. The keys show the regrouped ten, and the number line keys show every jump. All pages print in black and white on US Letter or A4.

Standards

  • CCSS.MATH.CONTENT.2.NBT.B.5Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
  • CCSS.MATH.CONTENT.2.NBT.B.6Add up to four two-digit numbers using strategies based on place value and properties of operations.
  • CCSS.MATH.CONTENT.2.NBT.B.7Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
  • CCSS.MATH.CONTENT.2.NBT.B.9Explain why addition and subtraction strategies work, using place value and the properties of operations.
  • CCSS.MATH.CONTENT.2.MD.B.6Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.

How to use them

  1. Start with base-ten blocks or a drawing: 38 + 25 is 5 tens and 13 ones, and 13 ones is 1 ten and 3 ones. Then move to 2-Digit Addition With Regrouping.
  2. Use Add Tens and Add Ones and the open number line pages for children who need to see why regrouping works, not just the steps.
  3. Give the Regroup or Not? pages once regrouping is steady. Children must look at the ones before they decide.
  4. Use Adding Three and Four Numbers when 2-digit addition is quick. The new ten can be 2 or 3 tens.
  5. Use Find the Mistake as a check: if a child can explain the wrong answer, they understand regrouping.

Teaching tips

  • Always start with the ones. Starting with the tens is the most common reason for wrong answers.
  • Say it out loud: 8 + 7 is 15 ones. That is 1 ten and 5 ones. Write the 5, put the 1 over the tens.
  • If digits wander out of their columns, use the pages with digit boxes, or turn lined paper sideways.
  • The new ten is still a ten. When children add the tens, remind them to add the small 1 too.
  • Check by estimating: 48 + 37 is about 50 + 40, so the answer should be about 90.

Questions teachers and parents ask

What is addition with regrouping?

When the digits in a column add up to 10 or more, you trade 10 ones for 1 ten (or 10 tens for 1 hundred) and move it to the next column. For 27 + 15, the ones make 12, so you write 2 and regroup 1 ten: 27 + 15 = 42.

Is regrouping the same as carrying?

Yes. Carrying and regrouping are two names for the same step. Regrouping is the word most schools use now because it says what really happens: 10 ones become 1 ten.

When do children learn addition with regrouping?

Most children learn 2-digit addition with regrouping in 2nd grade and 3-digit addition with regrouping later in 2nd grade or in 3rd grade.

Are there answer keys?

Yes. Every page has an answer key on page 2 of the PDF. The column keys show the regrouped ten in its box.