Answer:
1/3
Step-by-step explanation:
Steps to simplifying fractions
Find the GCD (or HCF) of numerator and denominator
GCD of 10 and 30 is 10
Divide both the numerator and denominator by the GCD
10 ÷ 10
30 ÷ 10
Reduced fraction:
1/3
Therefore, 10/30 simplified to lowest terms is 1/3.