Do it by hand

The Scratch Paper

Type a problem, then work it out yourself: + − × ÷ on squared paper, square by square, and anything else — expressions, equations, fractions, stories — line by line. The page checks as you go.

Squared paper: + − × ÷ of plain numbers, like 478 + 356, 47 × 23 or 847 ÷ 12. Line by line: anything else — 3(x − 2) + 4x, 2x + 5 = 17, 3/4 + 5/6, 20 − 12 ÷ 4 × 2, or a story problem.

Make a problem for me — pick what goes in it

Try

Your sheet

What to do next

Squared paper: tap a square, then type a digit; to borrow, tap the digit you borrow from. Line by line: write one step on each line and press Enter.