Maths Quiz - Level 3-4 Algebra - Putting Numbers in Place of Letters (Answers)
You've probably figured out by now that algebra is a big player in KS3 Maths. In algebra, instead of numbers, we use letters like a and b. When these letters stand for unknown numbers, we call them variables. But sometimes, we know the numbers they represent – and that's where equations come in.
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An equation happens when we give a value to an expression, making it equal something. Solving an equation is like detective work, figuring out what value the letter holds. It's a key part of maths, and you'll get the hang of it. This quiz keeps it simple – you're given some letter values, and it's your job to crack the questions. Practice makes perfect, especially in the algebra world!
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You can find more about this topic by visiting BBC Bitesize - Writing and interpreting algebraic expressions
2 + 3 + 2 = 7
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23 - 9 = 14
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Remember that when a number and a letter are together they need to be multiplied together
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Two letters together need to be multiplied together
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'If in doubt, write it down and work it out'
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(2 x 2) + (4 x 4)
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16 / 2 = 8
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You can make an estimate before you find the right answer. x2 + y2 would be too high, as would xy2. You can then check the other two more likely answers
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Notice that we did not give you a value for x and therefore you cannot work out the expression!
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4 + 9 + 16 - 5 = 24. Don't forget 'IF IN DOUBT, WRITE IT DOWN AND WORK IT OUT!
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