Maths Quiz - Level 3-4 Algebra - Expressions (Answers)
In your KS3 Maths lessons, you've probably encountered expressions. These are super important in algebra and overall in maths.
Algebra is like a secret code using symbols, often letters, to stand in for unknown numbers, called variables. These variables can change, or vary, depending on the situation. When you write down a situation as a maths sentence, it becomes an expression.
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In Algebra, think of an expression as a bunch of symbols showing a number or quantity. It can have numbers, letters, and symbols, and even a single number by itself is an expression. Understanding expressions is crucial in KS3 Maths, especially when dealing with BIDMAS/BODMAS.
Treat it like a puzzle – take your time, read each question carefully, and think through your answers. If you're confident with expressions, test yourself with this quiz!
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You can find more about this topic by visiting BBC Bitesize - Expressions and formulae
The correct answer might well be an English expression but it is NOT a mathematical one!
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A letter can be used in place of any number - especially if the number has not yet been worked out
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Let us suppose that a = 3. (5 x 3) + (7 x 3) = 36. This is the same as saying 12 x 3 (12a) = 36
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You must multiply the numbers together AND the letters. Remember a x a = a2
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Here we are adding numbers together, NOT multiplying them together
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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
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You have two times the number that I have got and 2 times x is the same as 2x
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If she is younger then her age is less than. 3 less than is the same as minus 3
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Don't get baffled by complicated wording - often the answer is easier than you think
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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 |