29 August, 21:16
2/15 + 1/3 and 6/7 - 1/3
which of the two sums is closer to 1/2?
you must show your working and state clearly weather the answer is 'A' OR 'B'
29 August, 22:30
6/7 - 1/3 is closer
2/15 + 1/3
get a common denominator 15
2/15 + 1/3 * 5/5 = 2/15 + 5/15 = 7/15
6/7 - 1/3
get a common denominator 21
6/7 * 3/3 - 1/3 * 7/7 = 18/21 - 7/21 = 11/21
now subtract 1/2 from each
7/15 - 1/2
14/30 - 15/30 = - 1/30
11/21 - 1/2
22/42 - 21/42 = 1/42
since we are trying to find which is closer we only care about the absolute value of the number (not whether it is positive or negative)
1/30 > 1/42
Know the Answer?
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» 2/15 + 1/3 and 6/7 - 1/3 A B which of the two sums is closer to 1/2? you must show your working and state clearly weather the answer is 'A' OR 'B'