I know they're really easy but I really struggle with serial dilutions. Is there any easy way to do them every time? Also could I get some help on this question, I've checked the mark scheme and the final answer is 2,340,000
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(234 x 10 x 10 x 10) to get 0.1 cm3 of bacteria in the original test tube and then x10 to get the number of bacteria in 1cm of solution. Hope this isn't too late.