You'll have come across expressions in your KS3 Maths lessons. By now you'll know that expressions are a very important part of algebra and, for that matter, of maths in general.
Algebra is all about using symbols, usually letters, to represent a number that we don’t yet know. We call these letters variables, as their value can change, or vary, depending on the situation. A situation can be written down as a mathematical sentence, or an expression. So, in Algebra, you can think of an expression as one or a number of mathematical symbols that represent a number or quantity. Expressions can contain any number of numbers, letters and symbols. Even a single number on its own is an expression.
As with any test, take your time, read each question carefully and think about your answer. Think you've mastered expressions? Then see how well you can express yourself by playing this quiz!














The correct answer might well be an English expression but it is NOT a mathematical one!

A letter can be used in place of any number  especially if the number has not yet been worked out


Let us suppose that a = 3. (5 x 3) + (7 x 3) = 36. This is the same as saying 12 x 3 (12a) = 36

You must multiply the numbers together AND the letters. Remember a x a = a^{2}


Here we are adding numbers together, NOT multiplying them together

Be careful to account for all the a's, then all the b's and then all the c's. In this case + 6c and  6c cancel each other out and therefore they do not appear in the simplification


You have two times the number that I have got and 2 times x is the same as 2x

If she is younger then her age is less than. 3 less than is the same as minus 3


Don't get baffled by complicated wording  often the answer is easier than you think

If you got the answer wrong then think carefully through each aspect of the question. Rosie's mother was 28 when Rosie was born. 4 years later, Suzie was born. Suzie is now x years old so Rosie's mother's age is now
28 + 4 + x = 32 + x 