First Step- Simplify the fractions if possible. 21/77 would convert to 3/11 and 33/41 would stay the same
Second Step- Multiply the numerators. Take 3 x 33 which is 99
Third Step- Multiply the denominators. Take 11 x 41 which is 451
Fourth Step- Simplify your answer if possible. 99/451 simplified is 9/41
Final Answer- 9/41