Practice solving subtraction problems of one-digit to five-digit numerals. Work column-by-column or by doing the math in your head and selecting from multiple choices.Proper borrowing is enforced in the column-by-column mode. You can display the borrowing in multiple-choice mode as a "helpful hint."Five background color choices, including white-on-black (with no grayscale) for users with mild visual impairment.Ideal for the classroom iPad, where the large numerals allow for demonstrations to a group or for team-based practices.
||Compatible with iPhone 4. iTunes account required.