Expressions are super important in algebra and all of maths. This KS3 Maths quiz is all about interpreting expressions. You may think algebra is no use in real life, but you would be very wrong!
So, when would we use algebra in real-life situations? You'll find lots of examples below. Keep in mind, the reason we study anything in maths is to eventually use it in everyday life!
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An expression is like a maths sentence. It's numbers and symbols grouped together to show the value of something. In algebra, think of an expression as symbols representing a number or quantity. Expressions can have any mix of numbers, letters, and symbols. Even a lone number by itself is an expression.
Think you're an expression pro? Test your skills by playing this quiz! Take your time, read each question carefully, and give it your best shot. Good luck!
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You can find more about this topic by visiting BBC Bitesize - Expressions and formulae
If John has two brothers more than Peter (x) then he must have x + 2 brothers
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In algebra the letters 'a' and 'x' are often used to represent unknown numbers but any letter can be used
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Don't get baffled with complicated questions. Sort out just the information that is required
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There are now x + 2 pens in the cupboard
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8 lots of 8 is the same as 8 x 8 or 82
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The correct answer means 64 times x. If we were then told that there were four boards at the club we could work out that the total number of squares was 256 (64 x 4)
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If Joseph has x rabbits then Sam has x + 3 so, between them, Joseph and Sam have x + x + 3 or 2x + 3
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If you answered x - 10 then you need to remember that EACH PERSON started with x sweets. x sweets DOES NOT represent the total number of sweets at the start
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Don't get baffled! Write it down and work it out
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If it takes 5 min for one man, then 2 men will take 1/2 that time, 3 men will take 1/3 that time,... z men will take 1/z of that time - that is 5/z min for each sack. Therefore, 20 sacks will take 20 x 5/z min. Of course, if they each filled their own sack, it would only take 5 min to fill 20 sacks
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