Grade 7 · Expressions & Equations

Formulas & substitution

87 problems in this skill, each with a solver-verified answer key. Answers are checked the moment you submit — with a hint if you want one and a worked solution afterwards.

What the problems look like

A few statements from this skill. Answers, hints and worked solutions live in the practice session.

Warm-up
The formula $F = \frac{9}{5}C + 32$ converts a temperature of $C$ degrees Celsius into $F$ degrees Fahrenheit. Find $F$ when $C = 15$ .
Warm-up
The formula $F = \frac{9}{5}C + 32$ converts a temperature of $C$ degrees Celsius into $F$ degrees Fahrenheit. Find $F$ when $C = 30$ .
Warm-up
The formula $F = \frac{9}{5}C + 32$ converts a temperature of $C$ degrees Celsius into $F$ degrees Fahrenheit. Find $F$ when $C = 20$ .

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