Proportion Notebook
Calculator Proportion Calculator Guides — Examples & Explanations

THE LEARNING SHELF

Start where you are.

A short guide for the step that is not quite clicking yet.

Start here

Solving proportions

Turn two equal ratios into one simple equation, then check your answer.

Keep handy

Formula reference

Find a, b, c, or d without losing track of the diagonal products.

Build confidence

Fractions & mixed numbers

Keep exact answers, simplify at the end, and avoid early rounding.

Number sense

Decimal proportions

Convert finite decimals exactly and decide when rounding belongs.

Understand the idea

Equivalent ratios

See why 2:3 and 8:12 describe the same relationship.

Apply it

Word problems

Translate units into matching positions before you calculate.

Beyond homework

Recipe scaling

Adjust ingredient amounts for a different number of servings.

Reading helps. Trying makes it stick.

Put the method to work with five questions.

Try practice →