SOLUTION: 4 1/5 X 10/21 X 9/20= Please show me how to multiply fraction if you could? The only whole number is the (4) in the first prblem. THANKS

Algebra ->  Trigonometry-basics -> SOLUTION: 4 1/5 X 10/21 X 9/20= Please show me how to multiply fraction if you could? The only whole number is the (4) in the first prblem. THANKS      Log On


   

Question 106479: 4 1/5 X 10/21 X 9/20=
Please show me how to multiply fraction if you could? The only whole number is the (4) in the first prblem. THANKS
Found 2 solutions by stanbon, checkley75:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
4 1/5 X 10/21 X 9/20=
= (21/5)*(10/21)*(9/20)
Cancel factors that are common to a numerator and a denominator
such as 21 and 10 to get:
= (1/5)*(1/1)(9/2)
= Multiply the numerators and multiply the denominators to get:
= 9/10
==============
Cheers,
Stan H.

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
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.