How to solve a two-step equation
Solve 3(x + 2) = 21.
Divide both sides by 3 first. Then isolate x by undoing the addition inside the brackets. A full worked answer includes a substitution check in the original equation.
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How to add fractions with different denominators
Work out 2/3 + 1/4.
The denominators must match before you add the numerators. Twelfths work here because 12 is a common multiple of 3 and 4; then combine the equal-sized pieces.
Read the previewHow to calculate average speed
A cyclist travels 180 metres in 30 seconds. What is the average speed?
Average speed is distance divided by time. With distance in metres and time in seconds, the answer is measured in metres per second (m/s).
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