Grade 3 · Year 4 · Class 3 · ages 8–9 · Addition
3-digit addition: Grade 3 practice
Adding three-digit numbers, with carrying across tens and hundreds. Eight questions at a time, instant feedback and a mastery score from 0 to 100.
This practice needs JavaScript. You can still print a 3-digit addition worksheet with an answer key.
Right answers raise your mastery score (more on harder questions) and wrong ones lower it a little. Your best score is saved on this device, and in your account if you log in.
The idea in one minute
Add the ones, then the tens, then the hundreds, carrying each time a column reaches 10.
Try these on paper first
One question at each level. Tap a question to see the answer.
Easy 474 + 236 =
Answer: 710
Medium 437 + 535 =
Answer: 972
Challenge 543 + 920 =
Answer: 1463
More ways to practise 3-digit addition
- Printable 3-digit addition worksheet with an answer key (new questions every time)
- All Grade 3 practice · Addition worksheets
Related skills
- 3-digit addition word problems (Grade 3)
- 2-digit addition (Grade 2)
- Adding money (rupees) (Grade 2)
- 2-digit addition word problems (Grade 2)
Take a break
Play a game that builds the same skills
FAQ
3-digit addition: questions
What grade is 3-digit addition?
It is usually taught in Grade 3 (Year 4 in England, Class 3 in India, ages 8–9), though schools and countries differ. Try the grade above or below if it feels too hard or too easy.
What does a 3-digit addition question look like?
For example: "437 + 535 =" The answer is 972. Add the ones, then the tens, then the hundreds, carrying each time a column reaches 10.
What should I learn before and after 3-digit addition?
Before it, try 2-digit addition word problems (Grade 2). After it, move on to 3-digit addition word problems (Grade 3).
How can I get better at 3-digit addition?
Add the ones, then the tens, then the hundreds, carrying each time a column reaches 10. Practise a little every day, read the hint after each wrong answer, and use the printable worksheet when you want to write it out.
Start a conversation
Need help with 3-digit addition?
A parent or guardian can tell us the grade and what feels hard, and we will suggest a starting point.
- Tell us the learner’s age or grade and goals
- We’ll suggest a suitable class or learning path
- We’ll confirm format, timing and fees with a parent or guardian