It is: 9/15 = 3/5
15 over 30 in simplest form is 1/2.
15/19 is already in its simplest form, because '19' is a prime number, and there are NO factors of '19' except '1' & '19'.
9/15 in its simplest form is 3/5
30/16 in simplest form is 15 over 8
As a fraction 15/60 We now look to cancel down/reduce. So we need to find a common factor. '2' is NOT a common factor because '15' is an 'odd' number, and will not divide by '2'. So try '3'. Yes!!! '3' is a common factor ; 3 x 5 = 15 and 3 x 20 = 60 So cancel down/reduce by '3' 15/60 = 5/20 Again we repeat the process. '2' is NOT a common factor '3' is NOT a common factor So try '5' Yes!!! '5' is a common factor ; 5 x 1 = 5 and 5 x 4 = 20 So cancel /reduce by '5' 5/20 = 1/4 The answer!!!! This is '15/60' in its fully reduced form ( 1/4 ; in words one quarter). However, your arithmetic may be more facile, and you can see that '15' is a common factor to both '15' & '60'. So you can reduce it directly to '1/4'. NB When cancelling down/reducing fractions us prime numbers to start the reduction process. . There are millions of prime numbers, but star by using ,2,3,5,7,11,13,.... Hope that helps!!!!
15/65 By cancelling down/reduction. We note, in this case, that both numbers end in '5'. So '5' is a common factor; 5 x 3 = 15 and 5 x 13 = 65 So cancel down/reduce by '5' 15/65 = 3/13 Since both '3' & '13' are prime numbers this will NOT reduce any further. Hence 15/65 in its simplest form is 3/13. NB Any number, however large or small, that ends in '5' or '0' , has '5' as a common factor. Refer to your '5' times multiplication table.
1/7
11/15
4 over 15 is already in lowest terms.
2x over 15
15/6 = 5/2 = 2 1/2
As a fraction 10/15 ; We reduce the faction by '5', because '5' is a common factor ; 5 x 2 = 10 amd 5 x 3 = 15 Hence 10/15 = 2/3 in its simplest form . NB When cancelling down/reducing any fraction look for the common factors in both the numerator(top) and the denominator(bottom) number. In this case, any number that ends in '5' or '0' has a common factor of '5'. So you reduce/cancel down by '5'. Refer to your 5 times multiplication table.