Percentages without a calculator

Building a percentage of an amount from 50%, 25%, 10%, 5% and 1%.

Percentage of an amount by multiplier

A percentage of an amount in one step with a decimal multiplier.

Writing one quantity as a percentage of another

One quantity as a percentage of another, and comparing different totals.

Percentages above 100%

Percentages greater than the whole, and the multipliers above 1 they give.

Percentage increase and decrease

Increasing or decreasing a quantity by a percentage with one multiplier.

Percentage change from two amounts

Finding the percentage rise or fall from the change over the original.

Reverse percentages

Recovering the original amount by dividing by the multiplier.