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Division of Decimals
• Dividing Decimals with the TI-34
•Rounding Quotients
•Applications of Decimal Division
To divide 36.248 / 4.6 do the following;
1.
2.
3.
4.
Enter 36.248
Press the [ ] button
Enter 4.6
Press [enter]
 4.24  ( 8)
7 221.2
 5.51
 0 .2
To round a quotient we;
1. Find the quotient using our TI-34
2. Round the answer to the given place value.
Examples:
2.1 75.3
To the nearest hundredth
0.6 81.4
To the nearest thousandth
1.
2.
3.
4.
4.5
4.4
-4.5
-4.4
 94.3  21
0%
1.
0%
2.
0%
3.
0%
4.
A repeating decimal is a decimal which repeats a pattern
of digits infinitely many times
0.3
5.67
2.493
When rounding repeating decimals it is necessary to write
out enough of the number so that the decimal can be
rounded to the given decimal place.
4.27
4.27
4.27
To the nearest tenth
To the nearest hundredth
To the nearest thousandth
When multiplying or dividing numbers it is important to place the
decimal point correctly. In the following problems determine if the
number is reasonable. If the number is unreasonable, move the
decimal point to a position that makes more sense.
Steve computed his gas mileage for his Honda Civic to be
3.2 miles per gallon.
Max makes $8.50 per hour. He estimates his weekly
paycheck to be $3400
Brooke owes $39,628.68 on the mortgage for
her house. If the monthly payment is $695.24,
how many months does she still need to pay?
How many years is that?
According to government tests, the 2009 Toyota
Prius, a hybrid car, gets 45 miles per gallon of
gas. If gasoline sells at $3.20 per gallon, how
many miles will a Prius travel on $20.00 of gas?
Alicia rides her bike 33.2 mi in 2.5 hr. What is
her speed in miles per hour? Round to one
decimal place.
A standard 75-watt light bulb costs $0.75 and lasts
about 800 hr. An energy efficient fluorescent bulb
that gives off the same amount of light costs $5.00
and lasts for 10,000 hr.
a) How many standard light bulbs would be needed
to provide 10,000 hr of light?
b) How much would it cost using standard light bulbs
to provide 10,000 hr of light?
c) Which is more cost effective?
Manny hikes 12 mi in 5.5 hr. What is his speed in miles
per hour? Round to one decimal place.
A membership at a health club costs $560 per year.
The club has a payment plan in which a member can
pay $50 down and the rest in 12 equal installments.
How much is each payment?
Population density is defined to be the number of
people per square mile of land area. If California has
42,475,000 people with a land area of 155,959
square miles, what is the population density? Round
to the nearest whole unit.