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5th grade math

 
 
Kim1056
 
Reply Tue 14 Aug, 2012 07:22 pm
I have 3 questions on math 1.) How do you turn 3 1/2% to a decimal. 2.) How do you turn $4.20 for 36 potatoes to a fraction in lowest terms. 3.) How do you turn this fraction 2 3/5 to a percent ???? Thanks for helping:))))
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Type: Question • Score: 1 • Views: 1,484 • Replies: 8
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raprap
 
  1  
Reply Wed 15 Aug, 2012 08:56 am
@Kim1056,
1) percentage is easy 100% fractionally is 1.0 and o.o1 (1/100) is 1%
2) $4.20 is the same as 420 cents--now 420 is a composite number (product of prime numbers)--break it into primes
420=(10)*(42)=(2*5)*(6*7)=2*5*2*3*7
36 is also a composite number
36=4*9=2*2*3*3
so 420/36=(2*5*3*3*7)/(2*2*3*3)
now multiplication is communitative (2*3=3*2)
so you can cancel like terms in the numerator and denominator (2/2=3/3=4/4=1) and you have a 1 and a 3 in the numerator and denominator. This product is also called the Greatest Common Divisor (GCD)
420/36=(2*5*2*3*7)/(2*2*3*3)=(5*7)/(3)
now turn this back into the composite
and you'll bet the number of cents per potato, divide this by the bumber if cents in a dollar to get that number.
3) turn 2 3/5 into an improper fraction 2 3/5= 10/5+3/5=13/5
now 1=100% (just like in problem 1) so multiply 13/5 by 100 to get %

Rap
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dalehileman
 
  1  
Reply Wed 15 Aug, 2012 11:06 am
@Kim1056,
Quote:
1.) How do you turn 3 1/2% to a decimal.
((2 x 3) +1)/2

Quote:
2.) How do you turn $4.20 for 36 potatoes to a fraction in lowest terms.
Guess at a common denominator: 420/36 = 210/18 = 105/9 = 35/3

Quote:
3.) How do you turn this fraction 2 3/5 to a percent ????
(((5 x 2) + 3)/5) x 100

Quote:
Thanks for helping:))))

(((You’re most welcome Kim
0 Replies
 
markr
 
  2  
Reply Wed 15 Aug, 2012 02:10 pm
@Kim1056,
For percentage conversion, there are two simple rules:
percent-to-decimal: divide by 100
decimal-to-percent: multiply by 100

1) convert the mixed fraction percentage to a decimal percentage and divide by 100:
3 1/2% = 3.5%
3.5% = 3.5 / 100 = 0.035

3) convert the mixed fraction to a decimal and multiply by 100
2 3/5 = 2.6
2.6 * 100 = 260%

2) The GCD advice given above is correct, but first you need to determine if your answer is to be given in dollars/potato or cents/potato - probably the latter which is what was provided. However, if the former, then you'd have to turn the numerator into an integer - in this case, multiply numerator and denominator by 5. That gives you $21 for 180 potatoes which can be reduced to $7/60 per potato.
raprap
 
  1  
Reply Wed 15 Aug, 2012 03:09 pm
@markr,
Woo potato Woo potato Woo potato Woo
Woo potato Woo potato Woo potato Woo
Woo potato Woo potato Woo potato Woo

Wo0 Batter Batter Batter



dalehileman
 
  1  
Reply Wed 15 Aug, 2012 04:17 pm
@raprap,
???
dalehileman
 
  1  
Reply Wed 15 Aug, 2012 04:17 pm
@raprap,
???
0 Replies
 
raprap
 
  1  
Reply Thu 16 Aug, 2012 05:56 am
@dalehileman,
I guess you never played little league baseball.
dalehileman
 
  1  
Reply Thu 16 Aug, 2012 02:32 pm
@raprap,
Rap guesses correctly
0 Replies
 
 

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