Richard Linnington

Estimation

Sometimes in real life, you don’t need the exact

Compound depreciation

When the value of something—like a car or a

Compound interest increases

Compound interest increases the value of savings or debt by

Percentage multipliers

Percentage multipliers are a quick and powerful way to increase

Calculating a percentage of an amount

Finding a percentage of an amount is a skill you&

Calculating one percent of an amount

Working out 1% of an amount is a handy skill

Finding five percent of an amount

Working out 5% of an amount is a handy skill—

Finding ten percent of an amount

Finding 10% of an amount is a quick and useful

Perimeter of rectangles with mixed metric units

Working out the perimeter of a rectangle is simple—just

Area of a trapezium / trapezoid

Trapezium? Trapezoid? You might not realise it but - regardless of