I could give you an answer for each number, but I suspect the answer required is 7 as it is the only Prime number, the rest are composite numbers.
15: (15, 1) (5, 3) 12: (12, 1) (6, 2) (4, 3)
Equivalent fractions to 6/15 = 12/30, 18/45, 24/60 Multiply 6/15 by 2/2, 3/3, 4/4,... 6 /15 * 2/2 = 12/30 6 /15 * 3/3 = 18/45 6 /15 * 4/4 = 24/60
252.
Factors for 12 are: 1, 2, 3, 4, 6, 12 Factors for 15 are: 1, 3, 5, 15 Factors for 24 are: 1, 2, 3, 4, 6, 8, 12, 24
5 6 7 10 4 15 12
15 because its an odd number whereas 6, 10 & 12 are even numbers.
80 x .15 = 12 pupils
15: (15, 1) (5, 3) 12: (12, 1) (6, 2) (4, 3)
Equivalent fractions to 6/15 = 12/30, 18/45, 24/60 Multiply 6/15 by 2/2, 3/3, 4/4,... 6 /15 * 2/2 = 12/30 6 /15 * 3/3 = 18/45 6 /15 * 4/4 = 24/60
5
252.
Factors for 12 are: 1, 2, 3, 4, 6, 12 Factors for 15 are: 1, 3, 5, 15 Factors for 24 are: 1, 2, 3, 4, 6, 8, 12, 24
6/8 9/12
5 6 7 10 4 15 12
The factors of 12 are 1, 2, 3, 4, 6, and 12 The factors of 15 are 1, 3, 5, and 15
1, 2, 3, 4, 6, 12 1, 3, 5, 15
1, 2, 3, 4, 6, 12 1, 3, 5, 15