A fraction is written in the lowest terms when it uses the smallest possible numerator and denominator. To put a fraction in the lowest terms, find the largest number that divides both the numerator and the denominator. Divide both the numerator and the denominator by that number.
you divide 7 by 7 and 35 by 7 and it gives you 1 over 5
so the lowest term for 7 over 35 is 1 over 5
hope it helps!