Learn Techniques

Break large numbers into parts and multiply each separately.

Simplify by dropping zeros, dividing, then restoring scale.

Use the 10% anchor to quickly find any standard percentage.

When you need % of %, multiply the decimals or use the shortcut.

99% of a number is just the number minus 1% of it.

Break non-round percentages into easy chunks.

Round to the nearest friendly number, then adjust.

Round and adjust for fast subtraction.

Drop the zeros, calculate with small numbers, restore scale.

Break one factor into tens and ones, multiply each part.

Factor the divisor into smaller numbers and divide step by step.

Apply multiple percentages sequentially to a base number.

Calculate the percentage increase or decrease between two values.

Multiply by 1.x by splitting into base + growth percentage.

Convert fractions to percentages using memorized benchmarks.

Always verify your answer is in the right ballpark.