Math help? GCSE exam soon!?

Yeah in a bit casualty has just started

Yeah in a bit casualty has just started

1) when dividing fractions, what you do is flip one upside down and then multiply the top and bottom, so in this instance you would do 3/7 x 1/8 (because 8 is equal to 8/1 and that is flipped upside down to become 1/8) and the answer is 3/56 2) what you do when taking fractions away is firstly make them top heavy (the number on top is larger than the number on the bottom) and make the numbers on the bottom the same and then take the smaller one away from the larger one. In this instance, you need to make 3.5 into 7/2 and 1 6/7 into 13/7, then you make the bottom number the same which would be 14 (as this is the smallest number that 2 and 7 (the numbers on the bottom) will go into, but you also need to times the top number up by the same amount (7/2 becomes 49/14 because top and bottom are multiplied by 7, 13/7 becomes 26/14 because top and bottom are multiplied by 2). Then you need to take the largest from the smallest, which is 49 - 26 (you take the top numbers away) which equals 23, so the answer is 23/49! 3) LCM (least common multiple) - what you do is separate the prime factors out - 23 has one prime factor which is 23 and 29 has one prime factor which is 29 - and then put these factors in a venn diagram and times all that you can see in the venn diagram, which is 23 x 29 in this instance, which is 667. HCF (highest common factor) what you do is separate out the prime factors - 23 and 29 again - and then put them in the venn diagram again and multiply anything in the middle. This instance is odd, as there is only one prime factor for both and so you take 1 to be a prime factor in both (even though 1 isnt a prime number) and 1 is the only number in the centre of the venn diagram so the answer is 1. HCF of 46 and 58 - prime factors of 46 are 23 and 2, prime factors of 58 are 29 and 2. In the Venn diagram, 2 is the only number common to both and so the highest common factor is 2.

http://www.gcse.com/maths/

4 litres is 4000ccs The glasses have volume of 3.142*3^2*10

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1) 3/7 x 1/8 (keep change flip)= 3/56 2) turn to improper fractions= 7/2 - 13/7, find the LCD,(14) = 49/14- 26/14, then subtract... 3) a. multiply them and then find the highest number that could divide that number b. those are prime numbers so the only common factor is 1 c. highest common factor is 2

The key to dividing fractions is to make the fractions on one straightforward line. For example- 3/7 /8 can be rewritten as 3/7 X 1/8. This is because dividing by any variable/number is the same thing as multiplying by it's reciprocal. i.e. the reciprocal of 17 is 1 / 17 and the reciprocal of 5483uqhigrfe is 1 / 5483uqhigrfe. So, now that we have 3/7 X 1/8 you can just multiply straight across. So, 3X1 (over) 7X8 which is 3/56 So, 3/7/8 is 3/56. When adding and subtracting fractions, you want to make common denominators. (denominator is tthe bottom number of a simple fraction) I have to go, i hope that helps with the first type of question.

so remember when dividing fractions, that you flip the second fraction and multiply it by the first, so write them out as fractions to make it easier: 1. 3/7 divide by 8/1 which is the same as 3/7 x 1/8 = 3/56 for number 2, write them as fractions, so you would times the whole number (e.g. 3) by the denominator (2) and then times by the numerator (1) 2. 7/2 - 13/7 find the common denominator (which in this case is fourteen) then for each see how many times the denominator goes into the common denominator, then times by the numerator so [(7x7) - (2x13)] / 14 = 23/14 = 1 and 9/14 least common multiple (LCM) is the smallest number that both the numbers can be divided into highest common factor (HCF) is the highest number that can be divided into both those numbers 3. usually the LCM is when you times the numbers together so 23x29 = 667 HCF of 23 and 29 is 1 (they are both prime numbers) HCF of 46 and 58 is 2 good luck with your GCSE (its not as bad as you think, then again i did do it 3 years ago)