i need to know what this would be when simplified also i need to know how you did it thanks
21
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35
I assume that you have heard about prime decomposition (?): Each natural number can be written as a product of prime factors OR (if the number is a prime factor itself) as $\displaystyle 1 \cdot number$.
The first prime numbers (which you should learn by heart) are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ...
There are an infinite number of prime numbers.
I examined 21: It is divisible by 3 that means 3 must be a factor in 21. The remainder is 7 which is a prime factor too. Thus $\displaystyle 21 = 3 \cdot 7$
Do the same with 35.
This seems way to obvious so it is probably wrong but..
Both 21 and 35 can be divided by 7.
$\displaystyle 21/7 = 3$
$\displaystyle 35/7 = 5$
So it simplified would just be $\displaystyle \dfrac{3}{5}$?