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Math 10/11Measures and Order of OperationsQuick Review:How is an exponent different than times?What is perimeter, area, surface area and volume? Which one is a line, which is 2D and which is 3D?Do you measure volume in ft2 or ft3 (flat squares or cubes of one foot)?What is an advantage of the Metric System?How is it organized?Is it good to use an online converter for different units (like Feet to Metres?)If you know that 2.5 cm is 1 inch. How can you figure out how many inches is in a cm?Using Imperial or other measures that aren’t a decimal.If you want to know:how many hours 55 minutes isHow many inches is 0.75 feet isHow much of a rotations 340? isHow many days of video games someone was trying to play (75 hours)You can make each into a fraction and divide them:55 minutes means 55/60 minutes. 55 ÷ 60 which is 0.92 hoursThe opposite is .75 x 12 is 9 Inches are out of 12 (decimals and your calculator are out of 10) so you multiply the decimal by 12.The last problem is easy to estimate. 340/360 = .94 rotations2106046525448Divide the number and see how much is left: You can divide the number by hours in a day: 75/24 =3.125 or 3 days and a bit. If you couldn’t do it in your head you could take the .125 and x that by 24 = … We use 60 minutes, 60 seconds and 360 degrees because Sumerians and Babylonians used numbers based on 60, 12, 360. They counted like this: Order of Operations-17081527305000With certain formulas you need to know order of operations.Try to remember some lazy moms. BEDMASThis stands for Brackets Exponents Division Multiplication Addition SubtractionIt just means you can’t do all problems left to right.Some problems you have to do the brackets first, the exponents second etc…This always comes up with:41505816902One is area of a circle: πr2Another is temperature: In the bottom case you have to do the brackets first:Continue 3+ Questions from last week orWhat is 70? Fahrenheit in CelsiusWhat is -40? Celsius in FahrenheitHow many years is 900 days?How many feet and inches is someone who is 2 metres tall?The tallest horse every was a Shire named Mammoth. He was 21.25 hands tall and 1500kgs. (one hand is 1/3 of a foot and 2.2 lbs is a kg). What was his height in feet and inches? How much taller than Malcolm was he? How much did he weigh in pounds?Killer Whales eat fish, sea lions and sometimes sharks. If a big Killer Whale is 22 000 lbs, a big Sea Lion is 2200 lbs and a big Great White shark is 5000 lbs? What is there difference in metric tonnes. (2200 lbs or 1000 kg is a tonne). ................
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