Jim Olsen Math & Science Mental Math Quiz 2 6 600 0 If the temperature starts at 15.3 °C drops by 2.8 °C, what is the temperature? (You may <i>leave off the units</i> from your answer.)1000312.5Correct.1100112.3Use the Equal Additions strategy to subtract. Try again.00113.5Use the Equal Additions strategy to subtract. Try again.00113.8An easy way to find 15.3 - 2.8 is to add .2 to each number and then subtact. Try again.0011.38Change it to 15.5 - 3. Try again.001If 20% of the coyote population is infected with the RST Virus and there are 3400 coyotes in the state, how many coyotes have the virus?10003680Well Done!1100168Take 2 times 34 and then "put the decimal place" in the only reasonable place. Try again.00134Take 2 times 34 and then "put the decimal place" in the only reasonable place. Try again.0013402 x 34 = 68. Choose between 6.8, 68, 680, 6800.00158010% is 340 and 50% ios 1700, so your answer should be between 340 and 1700.001Force equals mass times acceleration (F = ma). An object has a mass of 25 kg. What force is required to accelerate it 14 meters per second per second? 10003350Well done.1100125Multiply 25 x 14. Try again.0011400Use the Think Quarters strategy. Try again.001140Use the Think Quarters strategy. Try again.00139Use the Think Quarters strategy. Try again.001Force equals mass times acceleration (F = ma). An object has a mass of 25 kg. If it hit with a force of 225 Newtons, what is the acceleration?100039Well done.11001200F= ma → 225 = 25a → Solve. Try again.001250Use the Think Quarters strategy. Try again.00120Use the Think Quarters strategy. Try again.0012Use the Think Quarters strategy. Try again.001The river flows at a rate of 25,000 kL per hour. How much water flows in a day?10003600000Well done.11000600,000Well done.11001500,000Take 25 x 24 and add three zeros. Try again.0015000,000Ignore the three 0's (temporarily) then use the Think Quarters strategy. Try again.001480,000Ignore the three 0's (temporarily) then use the Think Quarters strategy. Try again.001Take 25,000 x 24. Try again.001We start with a supply of 4.3 L of iodine and use 1.6 L. How much iodine remains?100032.7Well done.110015.9Use the Equal Additions strategy to subtract. Try again.0015.8Use the Equal Additions strategy to subtract. Try again.0013.4Change the subtraction to 4.7 - 2.0. Try again.0013.2Change the subtraction to 4.7 - 2.0. Try again.001If sales tax is 7%, and the retail price is $400, what is the amount of the sales tax?10003$28Well done.1100028Well done.1100128.00Well done.11000$28.00Well done.1100024Find 7% of 400. Try again.0012.80Take 7 x 4 and then put the decimal point or add zeros so it make sense. Try again.00130.00Take 7 x 4 and then put the decimal point or add zeros so it make sense. Try again.001401% of 400 is 4 and 10% is 40, so the answer is between 4 and 40. Try again.001If there was a 40% increase in the number of accidents involving deer and vehicles from 2000 to 2008 and there were 500 accidents in 2000 (in Johnson County), how many accidents involving deer and vehicles were there in 2008?10003700Well done.11001200200 is the number of new accidents. To find the number of accidents in 2008, add 500 and 200. Try again.001520Find 40% of 500 and add it on to 500. Try again.001540To find 40% of 500 take 4 times 5 and put the decimal point in, or add zeros, to get the only reasonable number. (Then add this to 500.) Try again.001640What is the only logical answer for 40% of 500? 2, 20, 200, 2000...then add to 500. Try again.001In 2007, the percent of recyclable materials (such as cans on bottles) put into the Fitzgerald County landfill was 22.6%. In 2008, the percent dropped by 1.8%. What was the percent of recyclable materials put into the Fitzgerald County landfill in 2008?1000320.8 %Correct!!1100120.8%Correct!!1100024.4 %Use the Equal Additions strategy to subtract. Try again.00120.2 %Use the Equal Additions strategy to subtract. Try again.00119.8 %An easy way to subtract 22.6 - 1.8 is to change it to 22.8 - 2.0. Try again.00111.3%An easy way to subtract 22.6 - 1.8 is to add .2 to both numbers. Try again.001Last year there were 700 animals turned in to the Hanson County Humane Society. This year it has decreased by 4%. How many animals will be turned in to the humane society this year? 10003672Excellent?11001420Take 4% of 700 and subtract from 700. Try again.001980To find 4% of 700, multiply 4 x 7 and put in the decimal point, or add zeros, to make it reasonable. (Then subtract from 700.) Try again.001728To find 4% of 700, you need to choose from .28, 2.8, 28, 280, 2,800. (Then subtract from 700.) Try again.001696Take 4% of 700 and subtract from 700. Try again.001 Quiz Try to answer the following questions in your head. For this quickie quiz to DO NOT need to include your units. (Generally, in other settings you should include your units on all answers.) Correct! Sorry! Try again. Your answer is partly wrong: Please enter a guess. Next correct letter in the answer: Correct answers: Show answer 1 1 nextpage.htm 0 1 1 0 1 0 2 2 0 0 0 Your score is :-) X Questions answered correctly first time: Questions completed so far: You have completed the exercise. Your time is over! => <= Index 0 0 0 contents.htm Geneva,Arial,sans-serif small #ffccff #5d016d #FFFFFF #000000 #0000FF #0000CC #800080 http://yourserver.com/cgi-bin/FormMail.pl you@yourserver.com Please enter your name: one two three Questions answered correctly first time: Check OK => <= Hint Show all questions Show questions one by one 1 0 0