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Any tips for converting fractions to decimal, when the denominator is 13 or 15 or 17? eg 4/13, or 5/17 I can remember the pattern for most other denominators,
by Tempest1981 3y ago
Any tips for converting fractions to decimal, when the denominator is 13 or 15 or 17? eg 4/13, or 5/17
I can remember the pattern for most other denominators, like 3, 5, 7, 9, 11.
- colinbeveridge 3y agoFor 13ths, multiply your base number by 77, subtract 1, and concatenate the number that makes it up to 999. So, for 4/13: * multiply 4 by 77 to get 308 * subtract 1 to get 307 * concatenate 692 to get 307692 4/13 is 0.[307692] recurring. (This trick works largely because 77 × 13 = 1001). Seventeenths are trickier, but you can get a decent approximation if you multiply the numerator by 6/100, because 1/17 is 6/102.
- ted_dunning 3y agoThose are nice.
- ted_dunning 3y agoFor 15ths, convert x/5 to decimal, then divide by 3.