Add 3-Digit Numbers — Missing Addend Worksheets for 2nd Grade
Find the missing 3-digit number when the total is given. 15 free printable worksheets, each with an answer key.
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Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Add 3-Digit Numbers — Missing Addend: what children learn
A missing-addend problem shows the total and one part, so subtracting the part you know finds the other. The same idea works with three-digit numbers, with regrouping where needed.
Add 3-Digit Numbers — Missing Addend: worked example
215 + __ = 468 253
The total is 468 and one part is 215. 468 - 215 = 253.
Add 3-Digit Numbers — Missing Addend: a common mistake to watch for
Kids sometimes add the two numbers they see instead of subtracting.
Add 3-Digit Numbers — Missing Addend: how to help at home or in class
Draw a fact-family triangle with the total at the top and the two parts at the bottom corners. Cover one part with a sticky note and ask your child to write all four number sentences the triangle gives, two additions and two subtractions. Then pick the one with the blank solved as a subtraction. Use totals such as 640 and a known part such as 285. When they can fill any triangle quickly, they are ready for subtraction in columns.
What is on these Add 3-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:
- 232 + __ = 658426
- __ + 100 = 808708
- __ + 242 = 875633
- __ + 540 = 648108
- 105 + __ = 528423
- __ + 352 = 863511
- 754 + __ = 898144
- 198 + __ = 313115
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers