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Copy of Math 8- Rates, Ratios and Percentages
Transcript of Copy of Math 8- Rates, Ratios and Percentages
Johnston Michelle Nyoni! and Ratios a ratio is a comparison of quantities of the same unit ex. The ratio of teachers to children would be 1:5 However... there are many ways to write a ratio: Hannah
Johnston . words: one to five ratio notation: 1:5 fraction 1/5 Did you know??? The ratio of left handed people
to right handed people is 1:10
10 million to 1 The ratio of ants to humans is: Here are some examples of ratios and ex. 2/4 = 4/8 percentages Here is the market movement
of houses in greater Vancouver in 2011. Here are some real life examples of percentage use How to get to a percent: ratio 10 to 15 fraction 10/15 = 2/3 decimal 0.666 - percent 66.6% The origin of
the word "ratio"
Greek times. sldkgjgj;s kzshozxhfosifdhugsli akjdsfhudsdfjhpfoj sgklho;dcighoishglighf dfhiujpooioiorjiqpwoeirutalskjdfhg sldkgjgj;s sdihgjoxlhibodkgh sdkuhlskufh;lsh sodufhgilfuhpqoweiruty zkxjch fghg lkmn qqq move the decimal to the right twice divide to reduce the fraction change into fraction divide numerator by denominator to reverse move decimal to the left twice http://www.vancouversun.com/ percentages are also used for report cards
source: hannah's agenda A...86% and higher B...73-85%
c...60-66% c-...50-59% Rates a rate is an equivalent fraction ex. An intrest rate of 5% on a mortage. ex. An intrest rate of 18% on a credit card. ex. Intrest rate of 8% on a investment.
ex. intrest rate of
1.5 percent a
savings account. ex. TAX RATES HST 12% GST 5% Here are some real life examples: PST 7% Intrest Rate: the percentage of a sum of
money charged for its use rates can also be as simple as in a unit rate you always trying to find what the answer would be if the question was per one____ (unit) watch this video to learn more http://www.pne.ca/playland/ http://www.hrsdc.gc.ca Percentages relate to ratios but not to rates 25%= 1/4 25% = 1/4 = 2/8 admission, an houly fee or a price THANKS FOR WATCHING!!! The slope of a line tells us how something
changes over time. If we find the slope we
can find the rate of change over that period.
Take a look at the graph bellow. http://www.algebra-class.com/rate-of-change.html http://www.youtube.com/ unit rate: