If you are a student
Find the page for the method you are stuck on and read the worked example before anything else. Most confusion clears up when you see one full problem with no steps skipped. Then try the questions at the bottom on paper, and only then open the answers. Opening the answer first feels faster and teaches you very little.
If your answer is wrong, read the common mistakes section before trying again. Most wrong answers in arithmetic are one of about four specific slips, and they are all listed.
If you are a parent
The methods your child is taught may not be the ones you learned, and that is the most common reason parents land on this site. Partial differences, trade-first and counting up all reach the same answer as the borrowing algorithm you were taught. They differ in what they make visible.
It is worth resisting the urge to teach your own method immediately. A child who is mid-way through learning one approach and is handed a second one usually ends up mixing them. Learn theirs first, from the page they are working on, and compare later.
If you are a teacher
Pages are free to print and free to hand out. Each one is self-contained, works on a phone, and prints without the navigation. The self-check questions are not an assessment. There is no scoring, no timing and no record, by design, so a student can be wrong in private.
If you find an error, or an explanation that misleads more than it helps, we would rather hear about it than not. See the about page for how to reach the editors.
What this site does not do
- No accounts, no sign-in, no email collection.
- No scores kept, sent, or reported to anyone.
- No advertising, and no third-party tracking scripts on the pages.