Step by Step: Multiply Numerator by Numerator (7*2) and Denominator by Denominator (10*21). Get your answer 14/210. Divide the numerator and denominator by 14 and get 1/15.
Step by Step: Multiply Numerator by Numerator (4*18) and Denominator by Denominator (9*1). Get your answer 72/9. numerator and denominator by 9 and get 8.