can you help? I am confused?
1.Phil needs to practice free throws 7/10 of an hour each day. If he has already practiced 3/10 of an hour today, how much longer does he need to practice?
2.Kristi jogged for 3/5 ofan hour,swam for 1/2 of an hour,and rode her bike for 3/4 of an hour. How long did she execise?
3. Add 4 1/3, 3 1/9, 2 1/2=
4. 11/15 + 7/10 – 2/5 =
5. Which is larger ? 8/13 or 3/10
1) First, subtract the fractions: 7/10 – 3/10 = 4/10 of an hour. How many minutes are in an hour? 60. So, if you multiply both the 4 and 10 by 6 you will then have 24 / 60 of an hour. = 24 minutes
2) Again, combine fractions. This time, you need to put them in common terms. So, you have to find a number that is evenly divisible by 5, 2, and 4. How about 20? So multiply each of the fractions so that the bottom part is 20.
3/5 * 4/4 = 12 / 20
1/2 * 10/10 = 10/20
3/4 * 5/5 = 15 / 20
Then you can add them all together. 12 + 10 + 15 = 37. So you fraction would be 37/20. Following the same pattern as the first question, multiply by 3/3 to get a fraction of 111/60. So, you could say that she exercised for 111 minutes, (or you could subtract 60 minutes and say that she exercised for 1 hour and 51 minutes)
3) First, let’s take the whole numbers and sum them. 4 + 3 + 2 = 9.
Then, let’s look at the fractions. Again, we need a common denominator. What’s evenly divisible by 3, 9 and 2 ? How about 18?
1/3 * 6/6 = 6/18
1/9 * 2/2 = 2/18
1/2 * 9/9 = 9/18
Adding them all up we get 17/18. Add it to our sum of the whole numbers and you get 9 17/18.
4) Don’t let the subtraction fool you, this one works just like the others… What’s divisible by 15, 10, and 5? 30!
11/15 * 2/2 = 22/30
7/10 * 3/3 = 21/30
2/5 * 6/6 = 12/30
So now we take 22 + 21 – 12 = 31. So your answer is 31/30.
5) To see which is larger, you have to multiply them to get them both in the common denominator.. Let’s go with 13 * 10 = 130..
8/13 * 10/10 = 80/130
3/10 * 13/13 = 39/130
So, you can see that 8/13 is quite larger than 3/10.
This Morning – Gino says his grandmother is a bike & Holly & Phil crack up 18th May 2010
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