November Problem of the Day Calculations and Calculators: Decimals

November 1, 2012 – Ordering Decimals The first person to swim across the English Channel was Matthew Webb in Webb’s time was hours. The second, third, and fourth people and their times were Thomas Burgess, hours; Henry Sullivan, hours; and Enrico Tiraboschi, hours. Arrange the times in order from greatest to the least. The first person to swim across the English Channel was Matthew Webb in Webb’s time was hours. The second, third, and fourth people and their times were Thomas Burgess, hours; Henry Sullivan, hours; and Enrico Tiraboschi, hours. Arrange the times in order from greatest to the least.

November 2, 2012 – Estimating with Decimals Maria is ordering lunch at a fast-food restaurant. She estimates her bill as she is ordering. (All costs include sales tax). Following are her estimates for lunch. Maria is ordering lunch at a fast-food restaurant. She estimates her bill as she is ordering. (All costs include sales tax). Following are her estimates for lunch. Soda, $1.25; estimate $1.00 Soda, $1.25; estimate $1.00 Hamburger Special, $3.39; estimate $3.00 Hamburger Special, $3.39; estimate $3.00 Ice Cream, $0.99; estimate $1.00 Ice Cream, $0.99; estimate $1.00 Maria has only $5.00. Does she have enough money according to her estimate? Does she really have enough? Why or why not?

November 5, Rounding Decimals Merchants and store owners are reluctant to round prices down. If canned goods are priced 3 for $1.00 the price of one can is $0.333…but they charge $0.34 for a can if you only buy one. How much do you pay for one item? Merchants and store owners are reluctant to round prices down. If canned goods are priced 3 for $1.00 the price of one can is $0.333…but they charge $0.34 for a can if you only buy one. How much do you pay for one item? (a) 2 cans for $1.99 (b) 2 cans for $3.00 (c) 3 cans for $2.00 (d) 8 cans for $5.00

November 6, Addition Add the following: Add the following: (a) (b) (c) (d)

November 7, Addition Most cash registers provide an itemized receipt. Mary purchases the following items: Most cash registers provide an itemized receipt. Mary purchases the following items: Potato chips for $1.79 Candy bar for $0.59 Orange Juice for $2.29 Toothpaste for $2.79 Milk for $1.29 How much does Mary have to pay for these items?

November 8, Subtracting Subtract the following: Subtract the following: (a) – (b) – (c) 6 – 2.49 (d) – 0.058

November 9, Subtraction Being able to quickly count change is a valuable skill. Determine the change in the fewest bills and coins. Example: Purchase Price, $13.95; amount paid, $15.00; change, $1.05 (one dollar bill, nickel) (a) Price - $15.89 Paid - $20.00 (b) Price – $2.59 Paid - $5.00 (c) Price - $23.35 Paid – $30.35 (d) Price – Paid – $60.03

November 12, Multiplying Each product is “correct”; however, a decimal point is missing in one or both factors. You may need to add place holders (zeros). Is there more than one way to do this? Each product is “correct”; however, a decimal point is missing in one or both factors. You may need to add place holders (zeros). Is there more than one way to do this? (a) 36 x 54 = (b) 78 x 21 = (c) 324 x 65 = 2,106 (d) 7 x 3 =

November 13, Multiplying Which of the problems below are correct? Correct those that are wrong. Which of the problems below are correct? Correct those that are wrong. (a) x 0.56 = (b) 0.54 x 2.4 = (c) x 0.86 = (d) 34.7 x 6.7 =

November 14, Dividing Check the quotients by multiplying. If it is incorrect, correct it. Check the quotients by multiplying. If it is incorrect, correct it. (a) / 0.91 = 7.8 (b) / 7.6 = (c) / = 8.59 (d) / 0.36 = 0.085

November 15, Dividing To compute gas mileage, divide the number of miles driven by the number of gallons used. Sergio drove miles on 14.8 gallons of gas. What was Sergio’s mileage? Round to the nearest mile per gallon (mpg). To compute gas mileage, divide the number of miles driven by the number of gallons used. Sergio drove miles on 14.8 gallons of gas. What was Sergio’s mileage? Round to the nearest mile per gallon (mpg).

November 16, Multi-step Problem The average length of the three longest bones (all leg bones) in the human body are listed below. The average length of the three longest bones (all leg bones) in the human body are listed below. Femur – 19.88” Femur – 19.88” Tibia – 16.94” Tibia – 16.94” Fibula – 15.94” Fibula – 15.94” Find the average length of the human leg.

November 19, 2012 – Multi Step A unit price or unit rate is the amount charged per unit. A unit may be single item, a measurement or some other quantity depending, on the product. You can compare the cost of similar items by comparing unit prices. A lower unit price is a better buy. A 35- ounce box of cereal sells for $6.49. A 20- ounce box of the same cereal sells for $3.99. Which is the better buy? A unit price or unit rate is the amount charged per unit. A unit may be single item, a measurement or some other quantity depending, on the product. You can compare the cost of similar items by comparing unit prices. A lower unit price is a better buy. A 35- ounce box of cereal sells for $6.49. A 20- ounce box of the same cereal sells for $3.99. Which is the better buy?

November 20, 2012 – Multi-Step Problem A local restaurant pays cashiers $7.25 per hour, with time and a half (1.5 times the hourly wage) for overtime. This restaurant pays overtime for any hours more than 40 worked per week. Casey worked 43.5 hours last week. How much money did Casey earn? A local restaurant pays cashiers $7.25 per hour, with time and a half (1.5 times the hourly wage) for overtime. This restaurant pays overtime for any hours more than 40 worked per week. Casey worked 43.5 hours last week. How much money did Casey earn?

November 21, Multi-Step Problem Eat Rite Supermarket is having a “buy one get one free” sale on the 20-ounce box of Toasties cereal. One box sells for $3.99. Samantha has a coupon that is worth $0.75 off the 35-ounce box of Toasties. This box normally sells for $6.49. Which is the better buy? Why? Eat Rite Supermarket is having a “buy one get one free” sale on the 20-ounce box of Toasties cereal. One box sells for $3.99. Samantha has a coupon that is worth $0.75 off the 35-ounce box of Toasties. This box normally sells for $6.49. Which is the better buy? Why?

November 27, Multi-step Problem Vinny’s Pizza sells a 10-inch pizza for $8.49. The plan pie comes with tomato sauce and cheese. A special combination of any three additional toppings is $2.00 extra. If a fourth, fifth or sixth topping is selected; the cost is $0.45 per topping. What is the cost of a 10- inch pizza with anchovies, onions, peppers, and pepperoni? Vinny’s Pizza sells a 10-inch pizza for $8.49. The plan pie comes with tomato sauce and cheese. A special combination of any three additional toppings is $2.00 extra. If a fourth, fifth or sixth topping is selected; the cost is $0.45 per topping. What is the cost of a 10- inch pizza with anchovies, onions, peppers, and pepperoni?

November 28, 2012 – Multi-step Problem Electricians often charge a set amount for each hour they work, plus a service charge. The service charge doesn’t vary and is charged regardless of how long a job takes. How much would an electrician charge for doing 4.5 hours of work if the rate is $25 per hour, plus a service charge of $45? Electricians often charge a set amount for each hour they work, plus a service charge. The service charge doesn’t vary and is charged regardless of how long a job takes. How much would an electrician charge for doing 4.5 hours of work if the rate is $25 per hour, plus a service charge of $45?

November 29, 2012 – Multi-step Problem Long distance phone call are based on thre rates, calling point, and the time the call was made. A 15-minute long-distance call is calculated in the following manner: Long distance phone call are based on thre rates, calling point, and the time the call was made. A 15-minute long-distance call is calculated in the following manner: Up to and including the first 10 minutes, the cost is $0.09 per minute. Each additional minute is $0.03. Find the total cost of this 15-minute call.

November 30, Multi-step Problem An operator-assisted long-distance phone call is a call in which an operator “assists,” or helps, a person complete the call. Such calls are usually more expensive than calls the caller completes her- or himself. Dana was told that an operator-assisted call costs 1.5 times the cost of a direct dial call to the same city. Find the cost of the direct-dial call if the operator- assisted call costs $5.45. Round your answer to the nearest cent. An operator-assisted long-distance phone call is a call in which an operator “assists,” or helps, a person complete the call. Such calls are usually more expensive than calls the caller completes her- or himself. Dana was told that an operator-assisted call costs 1.5 times the cost of a direct dial call to the same city. Find the cost of the direct-dial call if the operator- assisted call costs $5.45. Round your answer to the nearest cent.