Alfred works forty hours per week at $7.25 per hour, the federal minimum wage. How much money does Alfred make per week?
(hours per week) x (rate per hour) = 40 x $7.25 = $290 per week. It ain't much, but he's still got Luis coming to him for a loan.
Karen drives a car to work every day. Whenever she stops for gas she puts 10 gallons in the tank. If gas costs $2.49/gallon (apparently Karen is still living in 2009) and she has to fill the tank twice a week, how much money per week does she spend on gas?
(cost per gallon) x (number of gallons) x (number of times per week) = $2.49 x 10 x 2 = $49.80
Jenny doesn't eat breakfast, but she spends five dollars a day on lunch and ten dollars a day on dinner. How much money does Jenny spend on food in a week? And what does she have against the most important meal of the day?
(cost of food per day) x (days per week) = ($5 + $10) x 7 = $15 x 7 = $105 or, (cost of lunch per week) + (cost of dinner per week) = $5 x 7 + $10 x 7 = $35 + $70 = $105. As for Jenny's aversion to breakfast, we can only assume she must have had some scarring run-in with a bacon strip as a young child.
Alison buys a $17.99 CD with a $20 bill. How much change does she get?
$20 - $17.99 = $2.01
Mary bought a pair of shoes for $34.50 and a pair of socks for $10.19. If she paid with a $50 bill, how much change should she get?
$50 - ($34.50 + $10.19) should get $5.31 change.
Zachary got $200 for his birthday. He bought a $50 stereo, 4 CDs at $9.99 each, and a 6-pack of root beer for $5.60. He put the rest in the bank. (Man, good taste in soda and he's saving for his future? Get him while he's single, ladies.) How much did Zachary put in the bank?
$200 - $50 - (4 x $9.99) - $5.60 = $104.44
To figure out the
total cost of 4 CDs at $9.99 each, we don't actually have to multiply
$9.99 by 4. That's too much work. Instead, we can round and then adjust
our figure later on to be more exact. Trust us—this will save you
valuable CD-buying time in the long run.
$9.99 is almost exactly
$10, so the CDs cost about $40 total. However, this estimate is $0.01
(one cent) too high for each CD. Since there are 4 CDs, the estimate is 4
cents too high. Instead of $40, the CDs cost $39.96. Well, golly gee,
that sounds a whole lot cheaper than $40! What marketing genius came up
with that idea? He should get a raise!
How much will it cost to buy 5 candy bars at $0.99 each?
Estimate is 5 x $1.00 = $5. This estimate is 1 cent too high for each book, so subtract 5 x $0.01, or $0.05, from the estimate. Final answer is 5 - $0.05 = $4.95.
How much will it cost to buy 5 books at $6.95 each? (A "book," FYI, was this contraption made out of paper that people used to read before the Internet came along.)
Estimate is 5 × $7 = $35. This estimate is 5 cents too high for each
book, so subtract 5 × $0.05 = $0.25 from the estimate. Final answer is
$35 - $0.25 = $34.75.
How much will it cost to buy 11 cookies at 97 cents each?
Estimate is 11 x $1 = $11. This estimate is 3 cents too high for each cookie, so subtract 11 x $0.03 = $0.33 from estimate. Final answer is 11 - $0.33 = $10.67.
Alice left a 10% tip on her bill of $14.50. How much of a tip did she leave?
How do you quickly figure out how much 10% of your bill is?
Move decimal place one space to the left.
How do you quickly figure out how much 20% of your bill is?
Move decimal place one space to the left, then multiply by 2.
Thomas left a 20% tip on his bill of $17. How much tip did he leave?
10% is $1.70, multiply by 2 to get $3.40. Hopefully his server won't be annoyed by those 40 pennies he left.
How do you quickly figure out how much 15% of the bill is?
Find 10%, divide by 2 to find 5%, multiply by 3 or add 10% and 5% together.
How much is a 15% tip on a bill of $17?
10% is $1.70, 5% is $1.70/2 = $0.85, 15% is $2.55.
A classroom of students is assigned a 152-page book to read. Four of the students decide they will each read a fourth of the book and then tell each other about it. Really, guys? 152 pages? You should just be glad you don't have a teacher who's obsessed with Anna Karenina. Anyway, how many pages must each devious student read?
There are 51 chairs in an auditorium, and three students have been assigned to put away the chairs. How many chairs must each student put away?
Alyssa has 4 cookies but 5 friends who want to try some. Alyssa decides to eat them all herself. Then, realizing this wouldn't make a very challenging math problem, she has a change of heart and decides to divide the cookies equally between her friends and herself. How much of a cookie does each person get?
Gabe has eaten a few cookies, but he still has nine left and his stomach is starting to grumble, so he decides to lay off them. If he shares these equally among six of his friends, how many cookies does each person get?