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Which fractions is the odd one out?

Couldn't do any of these which ones is the odd one out questions!

1)

1/4
1/6
1/15
1/9
1/5
1/12

2)

4/12
9/27
3/18
2/13
5/15
6/14

3)

11/19
5/12
9/13
7/8
3/7
7/28

Reply 1

Slumpy

1) Don't know
2) 2/13 can't be reduced, so I'd say it.
3) Don't know

Reply 2

maghreblover

1) 1/15

Reply 3

Notnek

maghreblover

1) 1/15

Why?

Handsolo: What level are you at and is there any more info in the questions?

Reply 4

Adampolar

notnek

Why?

maybe it's because it is the only one smaller than 1/13, this is too vague!

Reply 5

Audrey Hepburn

3) 7/28?

Because it's the only one whose reciprocal is a whole number?

Reply 6

rkd

3) 7/28 is the only one that can be simplified.

Reply 7

purplefrog

2) 2/13 - the only one that cant be simplified
3) 7/28 - the only one that can be simplified.

Reply 8

Audrey Hepburn

1) 1/5

This may sound a bit random, but it's the only one where the denominator is a prime number. That's about all I can think of for that one.

Reply 9

xxstace123xx

Its the summer hollidays lol...

My brain is switched of for 6 weeks, :smile:

Reply 10

wanderlust.xx

Audrey Hepburn

1) 1/5

This may sound a bit random, but it's the only one where the denominator is a prime number. That's about all I can think of for that one.

Or because the denominator is the product of only one prime number - 5 x 1, whereas all other denominators are products of two or more prime numbers.

3x5
2x2
3x2
3x2x2
etc

Reply 11

Holty-Dave

woah don't have too much fun

Reply 12

JohnnySPal

wanderlust.xx

Or because the denominator is the product of only one prime number - 5 x 1, whereas all other denominators are products of two or more prime numbers.

3x5
2x2
3x2
3x2x2
etc

You can write all numbers as a product of primes. Uniquely, too!