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What is the percentage of 4 wrong out of 25?
It is: 21/25 times 100/1 = 84%
What times what equals 84 the answer's sum is equal to 17?
The factor pairs of 84 are (84,1)(42,2)(28,3)(21,4)(14,6)(12,7) None of them add up to 17. If that was -84, you could use 21 and -4.
What is the least common multiple of 3 4 7?
It is 84. 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84 4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84 7,14,21,28,35,42,49,56,63,70,77,84 It is 84. 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84 4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84 7,14,21,28,35,42,49,56,63,70,77,84
What times what gives you 84?
13 is prime, like 7. So you would need the 13 times table (like you would need the 7 times table for 7).
How do you find a LCM?
say if you had to find the LCM of 4 and 3 you can go up in the 4 times table or the 3 times table (4times table will be quicker because it's a bigger number) 4 times table= 4, 8, 12, 16, 20, 24, 28 3 times table= 3, 6, 9, 12, 15, 18, 21 find the number that is in both times tables (has to be the LOWEST common number) in this case is 12 because it is in both lists. Once your able to do this, you'll get use to the idea and you can think of other ways to do it, but this way is good for people that have just started. It would be easier if you know all of your times tables up to 10.
