## Friday, November 13, 2009

### How I stopped an Alien Invasion by using Proportion

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#4 Determine the unit rate.

a) Three diner rolls cost 99 cents.

You make a ratio table then put cents on the left side and rolls on the right side. Under the cents put 99 and under the rolls put 3. Divide the right side by 3 and the other side by three also, it will give you its unit rate. Which makes 3/3 = 1 and 99/3 = 33. 3 cents a roll.

b)Seven identical objects have a mass
of 14 kg

Make a ratio table the on one side put objects then on the other side put kg. Under object put 7 because there are 7 objects and under kg put 14 because it has a mass of 14 kg. Then to find the unit rate you need to divide 14 by 14 which is one. Then you do the same thing on the other side. 7 divided by 14 + 0.5.

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7 min. If he continues sawing at a constant
rate, how long will it take him to saw a

Make a ratio table then on one side put pieces and on the other side put minutes. Then under pieces put 3 because he can saw 3 pieces. Then under minutes put 7 because he can saw 3 logs in 7 minutes. Then you need to find how many minutes would he take if he saws 6 pieces of logs. So 3 x 2 =6 + 6 logs. Then under the 7 put 14 because 7 x2 =14.

24. a) Describe a pattern you could use to find
the next fraction in the following set of
fractions.

The pattern is that the numerator goes up by 1 and the denominator goes up by 2's

1/2

2/4

3/6

4/8

The pattern is that the numerator goes up by 5's and the denominator goes up by 6.

5/6

10/12

15/18

20/24

The Aliens are taking over the earth !

One day me and Jem was playing basketball in my backyard. There was something in the sky, I thought it was a balloon. Then I came tumbling down it was a UFO and it ruined the grass in my backyard. Then green aliens came out of UFO and walked towards Jem and I. The aliens told us " We are going to destroy your planet and make it a huge crater for us to live on. But if you answer these 3 proportion questions we will leave and nver come back again." We told them bring it on. The green alien asked me "Three rolls for 99 cents what is its unit rate ?" I answered " The unit rate is 33 cents for 1 roll. The alien was surprised that I got the answer. Then the purple alien came up to Jem and asked her "David can saw a log into three pieces in
7 min. If he continues sawing at a constant rate, how long will it take him to saw a similar log into six pieces?" Jem answered " It would take him 14 minutes to cut 6 pieces of wood. The purple alien gasped. Then this pink polka dotted alien came up to me and asked "Describe a pattern you could use to find the next fraction 1/2, 2/4, 3/6." I answered, " The next fraction is 4/8 because the numerator goes up by 1 and the denominator goes up by 2. The weird polka dotted alien was surprised. Then the leader told us you win, we will never come back ever again. Good-bye.