Maths Quiz - Level 5-6 Algebra - Formulae (Answers)
Now that you're diving into KS3 Maths, you've encountered loads of formulae. They help us figure out areas, volumes, scientific stuff, and much more. Algebra comes in handy if we need to re-arrange formulae - so don't say algebra is useless!
What exactly is a formula? It's like a pair of maths expressions joined by an equals sign. Usually, we remember them in one setup, like the area formula for a circle: area = πr2. Easy if you know 'r', but what if you're given the area and need to find 'r'? You have to rearrange the formula. Do you know how?
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This quiz lets you dip your toes into the world of formulae! Take your time, read each question carefully, and don't forget the helpful comments afterward. They might shine light on things you missed. Good luck!
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You can find more about this topic by visiting BBC Bitesize - Expressions and formulae
Either can be used
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We call them variables because their values vary
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Remember that all formulae contain an equals sign
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2b = 2 x 4. We have been told that a = 2b and therefore a must be 8
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30 - 2 = c. Sometimes you have to work backwards in order to find the answer
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If a = 3 then a 2 = 9. 25 - 9 = 16 so b 2 = 16, therefore b must = 4
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In this case you have two variables (a and b) and there is no reason why they cannot both have the same value - in this case 6
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Don't worry, you will NOT normally be presented with formulae that don't add up!
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Perimeter means 'all the way around the outside'
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If m is the number of miles travelled in one hour then the miles covered in 4 hours would be 4 x m or 4m
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