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Add 2-Digit Numbers — Missing Addend Worksheets for 2nd Grade

Find the missing 2-digit number when the total is given. 15 free printable worksheets, each with an answer key.

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Free Add 2-Digit Numbers — Missing Addend Worksheets

Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.

Add 2-Digit Numbers — Missing Addend: what children learn

A missing-addend problem shows the total and one part. Taking the known part away from the total finds the other part, because addition and subtraction undo each other.

Add 2-Digit Numbers — Missing Addend: worked example

34 + __ = 59 25

The total is 59 and one part is 34. 59 - 34 = 25.

Add 2-Digit Numbers — Missing Addend: a common mistake to watch for

Kids sometimes add the two numbers they can see instead of subtracting.

Add 2-Digit Numbers — Missing Addend: how to help at home or in class

Turn it into a story: a collection holds 72 stickers and 45 are already in the album, so how many are loose? Have your child draw a number line, start at 45, hop by tens to 65, then add the last ones to reach 72, counting each hop. Check by adding the loose stickers to the album ones. Once they can pick the hops without help, three-digit missing numbers are a natural next step.

What is on these Add 2-Digit Numbers — Missing Addend worksheets

This set has 15 different worksheets for 2nd grade, with 12 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Find the missing number in each addition problem.”

Example questions like the ones on these worksheets, with their answers:

  • __ + 12 = 3422
  • 24 + __ = 7955
  • 66 + __ = 9327
  • __ + 17 = 8568
  • 42 + __ = 8341
  • __ + 15 = 9883
  • 27 + __ = 4316
  • 61 + __ = 8120

Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers

Related Addition worksheets for 2nd grade

Whole Tens — Missing Number
Find the missing number when two whole tens make a total, like 40 + __ = 110.
Add 2-Digit Numbers (No Regrouping)
Add two 2-digit numbers in columns when the ones add to less than 10.
Add 2-Digit Numbers (With Regrouping)
Add two 2-digit numbers in columns when the ones make 10 or more (sums up to 99).
Add a 2-Digit Number and 1-Digit Numbers
Add a 2-digit number and two or three 1-digit numbers, like 34 + 8 + 7.
Add Three 2-Digit Numbers in Columns
Add three 2-digit numbers stacked in columns.
Add Four 2-Digit Numbers in Columns
Add four 2-digit numbers stacked in columns.
All Addition worksheets
See every addition topic for 2nd grade