Third grade extends the column methods to three digits: adding and subtracting within 1,000, where a problem can carry twice or borrow across a zero. Both numbers here run from 100 to 999, set out vertically with the ones, tens and hundreds lined up.
Mixed regrouping is the default, so some problems carry and some do not and each one has to be looked at. Borrowing across a zero - 403 minus 158 - is the step that most often goes wrong, and it turns up on almost every page.
Yes. Set Regrouping to Regrouping Only in the advanced options and every problem will carry or borrow at least once.
The subtraction answers always do. An addition problem can pass 1,000 when two large numbers meet; untick the higher hundreds in one range to keep every sum below it.
Yes, free to generate, download and print, with no account and no watermark.