Question 106479
FIRST YOU CONVERT THE MIXED NUMBER 4 1/5 TO AN INPROPER FRACTION 21/5
NOW MULTIPLY ALL THE NUMERATORS & DIVIDE BY THE PRODUCT OF ALL THE DENOMINATORS.
REDUCE WHEREEVR POSSIBLE.
21/5*10/21*9/20=(21*10*9)/(5*21*20)=21/21=1, 10/20=1/2 NOW WE HAVE: 1*1/2*9/5=9/10 ANSWER.
THIS IS A SHORT CUT METHOD. RATHER THAN MULTIPLYING 21*10*9=1890 & THEN MULTIPLYING 5*21*20=2100 AND TRYING TO REDUCE THE FRACTION 1890/2100=189/210=63/70=9/10.