3-Digit Addition Worksheet for Kids
Adding two three-digit numbers requires children to work through the ones, tens, and hundreds columns in order and understand how a sum in one column can carry over into the next, a significant step up from single-digit addition. For ages six to eight, mastering this column-based process builds the procedural fluency needed for all future multi-digit arithmetic.
Part of the pack
Month 7: Foundational English Math Science | Ages 6-7Curriculum
How to use this worksheet
Look at the first addition problem together and identify the ones, tens, and hundreds columns before starting to solve. Have your child add the numbers in the ones column first, writing the result and carrying over a digit to the tens column if needed. Move to the tens column next, then the hundreds column, adding each in order and writing the digit for each place value. Continue through the remaining problems on the page, checking that your child is working through the columns in the correct order each time.
Materials needed
- Pencil
- Eraser
Extension activities
- •Create your own 3-digit addition problems using numbers from a phone number, address, or birthday.
- •Use manipulatives like base-ten blocks or bundled straws to visualize what's happening when a column carries over.
- •Play an addition card game, drawing two 3-digit number cards and solving the sum together as fast as possible.
- •Check answers using a different method, like estimation, to build confidence that the exact answer makes sense.
Tips for parents and teachers
Encourage children to show their work column by column and double-check their answers, especially watching for missed carrying between columns, which is the most common error at this stage. Provide assistance as needed, but allow them to work independently as much as possible, since working through mistakes is often how the carrying process finally clicks.
Written by
Hemsweta Jain · Teacher Cheena
MBA and Early Childhood Educator, teaching since 2014 · Founder of RaisoActive, Mumbai
Every RaisoActive worksheet is designed and checked by the founder before publishing.
Published · Last reviewed
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