ISMM1-UC 726 Lecture : Maths IGCSE.pdf
31 Jan 2013
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{also use the intranet revision course of question papers and answers by topic : decimals and standard form (a) multiplying and dividing top. Move the decimal points to the right until each is a whole (i) number, noting the total number of moves, perform the multiplication, then move the decimal point back by the previous total: {note in the previous example, that transferring a factor of 2, or even better, 4, from the 136 to the 25 makes it easier: , so the answer is (25 4) 34. Move both decimal points together to the right until the (ii) divisor is a whole number, perform the calculation, and that is the answer. In this case, both numbers share a 7, so divide this out: , but simplify the calculation by cancelling down any factors first. , then the n th digit is raised by 1.
