3.07 Decimals in the real world
Round the following to the nearest cent:
\$34.7691
\$64.4725
\$254.899
\$32.455
Round the following to the nearest five cents:
\$27.82
\$64.86
\$34.89
\$57.54
\$227.02
\$634.67
\$1024.98
\$21.94
Harry buys an item from the school canteen for \$3.20. If he pays for it with a five dollar note, how much change will he get back?
A customer gives the cashier \$100 to pay for a purchase of \$64.95. How much change should the cashier give the customer?
Amy is buying some supplies for the new school year. She buys an exercise book for \$9.55, a pack of pens for \$6.12 and a pencil case for \$6.28. How much does she spend in total?
A calculator is 15.9 \text{ cm} long.
Convert this length to metres.
Lisa purchased a car and is paying monthly installments of \$148.40 to pay it off. If it takes her 60 months to pay it off, how much will she have spent on car repayments in total?
James used a calculator to evaluate 3.179 \times 3.96 but forgot to enter the decimal points. The answer he got was 1\,258\,884. What should the answer have been?
If Skye earns \$238.42 for working 7 hours, how much does she earn per hour?
Three items weighing 1.22 \text{ kg}, 4.66 \text { kg} and 2.77 \text{ kg} are to be posted but are found to be over the 8.11 \text{ kg} limit. By how much does the total weight exceed the limit?
A piece of timber 3.32 \text{ m} long is cut evenly into smaller pieces each measuring 0.04 \text { m}. How many of these pieces can be cut?
Quentin recorded the following times in the 100 \text{ m} running race over a whole season.
How much quicker was his fastest time than his slowest time?
| Race | Time (seconds) |
|---|---|
| 1 | 10.59 |
| 2 | 11.03 |
| 3 | 10.45 |
| 4 | 10.38 |
| 5 | 10.63 |
How many 0.38 \text{ L} bottles can be filled from a barrel which holds 41.8 \text{ L}?
How much would you pay for eight t-shirts if they cost \$46.88 each, and you receive a discount of \$9.47?
Neville trains six days a week. Each weekday, he runs 2.4 \text{ km} and on Saturday, he runs 4.6 \text{ km}. How far does he run in a whole week?
At midnight, the temperature in Darwin is 29.6 \degree \text{C}. Each hour after that the temperature decreases by 2.34 \degree \text{C} until the sun comes up. Find the temperature at 4 am.
Pauline is making 5 chocolate coated strawberries for her friends. She has 52.5\text{ g} of chocolate which she uses to evenly coat the strawberries.
One of the strawberries has a mass of 19\text{ g}. Choose the most reasonable estimate for its mass once it is coated in chocolate:
29\text{ g}
69\text{ g}
9\text{ g}
10\text{ g}
Calculate the exact mass of the 19\text{ g} strawberry after it is coated in chocolate.
William earns \$304.92 for 5 days of work.
Choose the most reasonable estimate for how much William earns per day:
\$6.10
\$610.00
\$61.00
\$152.50
Calculate how much William earns each day.