Long Division Solver
Enter a dividend and divisor to see the long-division algorithm worked out one step at a time — with the reasoning behind each move.
Quotient 42, remainder 1
- 1
Look at the first digit, 1.
3 doesn't fit into 1, so write 0 in the quotient.
1 − 0 = 1
- 2
Bring down the 2, making 12.
3 goes into 12 4 times (4 × 3 = 12).
12 − 12 = 0
- 3
Bring down the 7, making 7.
3 goes into 7 2 times (2 × 3 = 6).
7 − 6 = 1
127 ÷ 3 = 42 R 1
About the Long Division Solver
Long division usually breaks down into two separate skills: doing the actual division, and tracking where every digit goes on the page. This tool keeps both visible at once — a classic stacked layout with the quotient and dividend lined up, alongside step-by-step cards that narrate each bring-down and each 'how many times does it go in' decision.
Every step has an optional reasoning explanation, so a student stuck on why you bring down the next digit, rather than starting over, can check that specific moment without losing their place in the rest of the problem.
How to use it in your classroom
- Enter a dividend and a divisor.
- Look at the stacked division layout to see the quotient build digit by digit.
- Read each numbered step below for what happened and why.
- Click 'show reasoning' on any step a student is stuck on.
Tips from the classroom
- Use a divisor that doesn't divide evenly at first, so students see how a remainder gets carried and finally reported at the end.
- Walk through the stacked layout first as a class, then assign similar problems and have students narrate their own steps out loud the way the tool does.
- Leading zeros in the quotient are faded rather than removed entirely, which is a good moment to explain why we don't write a 0 in front of a multi-digit answer.
- Pair this with a math worksheet generator covering the same divisor so students practice with several different dividends right after.
Frequently asked questions
Does it show remainders?
Yes, both in the final answer line and worked into the last step's subtraction, exactly the way the remainder would appear at the bottom of a hand-written problem.
What's the largest number it can divide?
There's no hard cap built into the controls, but very large dividends will simply produce more steps to scroll through.
Can I use a decimal divisor?
No, both the dividend and divisor are treated as whole numbers in this tool.