1) (10)/(20)=5/10 2) (20)/(70)=10/35 3) (3)/(12)=1/6 4) (4)/(18)=2/9 5) (16)/(80)=6/4

## Step 1: Finding the Greatest Common Divisor (GCD)### To simplify a fraction to its lowest terms, we need to find the greatest common divisor (GCD) of the numerator and the denominator. The GCD is the largest number that divides both numbers without leaving a remainder.## Step 2: Simplifying ### The GCD of 10 and 20 is 10. Dividing both the numerator and the denominator by 10, we get: .## Step 3: Simplifying ### The GCD of 20 and 70 is 10. Dividing both the numerator and the denominator by 10, we get: .## Step 4: Simplifying ### The GCD of 3 and 12 is 3. Dividing both the numerator and the denominator by 3, we get: .## Step 5: Simplifying ### The GCD of 4 and 18 is 2. Dividing both the numerator and the denominator by 2, we get: .## Step 6: Simplifying ### The GCD of 16 and 80 is 16. Dividing both the numerator and the denominator by 16, we get: .