About Sumpage
Squared paper for column sums, worked out by hand
Sumpage is a page of squared paper on a screen. Children write sums anywhere on it and work them out themselves: carrying, borrowing and crossing out, just like in an exercise book. It's free, needs no account, and never shows the answers.
Why Sumpage doesn't show the answers
Most maths apps check every answer straight away. That's useful for drilling facts, but it changes how children work: they guess, look for the green tick, and try again. Written column methods are about the steps (lining up the place values, carrying the ten, borrowing from the next column), and those steps are what Sumpage gives room for.
So Sumpage behaves like paper. It keeps every digit in the square it was written in, puts carries where they belong, and lets children cross out a digit to borrow. It never says whether the answer is right. You can go through the sum together afterwards, the same way you would with homework.
How it works
- Tap an empty square and type the top number.
- Write the next number on the line below. It's a plus sum unless you tap the sign box to change it to minus or times.
- Tap under the line to start the answer. Answer digits move left automatically, because column sums run right to left.
- Carry and borrow. Small red boxes above each column take carries. Tap a digit to cross it out when borrowing.
- Pull the line down to add another number (up to six), or start a new sum anywhere on the page.
What children can practise
- Column addition with carrying, with up to six numbers stacked.
- Column subtraction with borrowing (exchanging) and crossing out.
- Long multiplication with a partial row for each digit, each with its own carry row, added up under a line.
- Lining up place values: numbers can be written misaligned on purpose, so children learn to line up the ones.
Works on iPad, tablets, laptops and phones
Sumpage runs in the web browser, so there's nothing to install. On a touch screen, a large number keypad appears at the bottom. On a laptop, children type with the keyboard. There's also a pencil for drawing and doodling, with pressure from a stylus, and a dark "space" theme.
Privacy
No accounts, no sign-up, no ads and no cookies. We count visits anonymously with Cloudflare Web Analytics, which uses no cookies and collects no personal data, so we can see roughly how many people use Sumpage and from which countries. Your child's sums are saved only in the browser on your device, so they're still there next time, and they stay there until your child taps New page.
Questions
Is Sumpage free?
Yes. Sumpage is free to use, with no account, no sign-up and no ads.
Does Sumpage check the answers?
No. Sumpage never shows or checks answers. Children work each sum out themselves, the way they would on paper, so the thinking stays with them. You can check the work together afterwards.
Which sums can children practise?
Column addition with carrying, column subtraction with borrowing, and long multiplication with a partial row for each digit. Addition and subtraction sums can stack up to six numbers.
What devices does Sumpage work on?
Sumpage runs in the web browser on iPad and other tablets, laptops and phones. On a touch screen it shows a number keypad; with a keyboard, children can type directly.
Is my child's work saved?
Yes, on your device only. Sums are kept in the browser after every change and stay there until your child taps New page. Nothing is uploaded and there are no accounts.
What age is Sumpage for?
Primary school children, roughly 7 to 12, who are learning or practising written column methods.