Decrease All Digits in a Number

Every digit can step backward on its own. A 7 becomes 6, a 0 becomes -1 - and because no column ever borrows, a number like 200 collapses into something no ordinary subtraction would produce: 1,-1,9-9. It is the mirror image of increasing all digits, a puzzle played on the columns of a number rather than on its value.

Decrease All Digits in a Number subtracts the same amount from every digit, column by independent column. Choose the amount, and the tool rewrites each digit in place - signs stay up front and the decimal point holds its position. See the per-column breakdown and copy or download the result.

• No borrowing: Every digit is decreased independently, column by column.
• Per-digit amount: Subtract from 1 to 9 from each digit.
• Column breakdown: The result shows each original and decreased digit side by side.
• Sign-safe: A leading plus or minus never gets decreased.
• Decimal aware: Only integer digits change; the point stays put.
• Text-exact: Every column computes exactly at any number size.
• Copy or download: Export the transformed number for puzzles or patterns.
• Free and private: Everything runs locally; nothing is uploaded or stored.

1. Enter a number - with any sign or decimal part you need kept.
2. Choose the amount - how much each digit should fall, 1 to 9.
3. Read the per-column result - every digit decreased in place.
4. Check the breakdown - original and decreased digits side by side.
5. Copy or download the transformed number.

Example 1 - All fall. Enter 987, subtract 1: 8,7,6.

Example 2 - The borrowless zero. Enter 200, subtract 1: 1,-1,9-9 - no borrowing, each column alone.

Example 3 - Higher amount. Enter 765, subtract 2: 5,4,3.

Example 4 - Sign kept. Enter -456, subtract 1: -3,4,5 - the sign never decreases.

Example 5 - Decimal. Enter 1.0, subtract 1: 0.-1 - the point stays, the fraction digit falls too.

• Digit puzzles made easy: Explore borrowless arithmetic on any number in one click.
• Full control: The per-digit amount shapes exactly how far each column falls.
• Visible mechanics: The column breakdown shows the transformation digit by digit.
• Exact at any size: Text-based columns keep every digit, even beyond float precision.
• Signs and decimals respected: Real numbers transform without their structure breaking.
• Private and free: All transformation stays in the browser; nothing is uploaded or logged.