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Find the missing measurement in the figure.
a=1.3 meters b=1.3 meters c=3.7 meters
Write the fraction or mixed number as a decimal. Round to the nearest thousandth if necessary.
Even with most of the problem missing, it is possible to tell whether a suggested answer is reasonable. Determine
whether the answer given is reasonable. If it is unreasonable, move the decimal point or insert a decimal point to make
the answer reasonable.
What was the price of the book? $23
Unreasonable, should be $2300
Unreasonable, should be $230
Unreasonable, should be $2.30
Write the decimal point in the correct location.
A rectangular garden measures 12.3 meters by 48.6 meters. What is its area?
Arrange the group of numbers in order, from least to greatest.
Use front–end rounding to round each number. Then, multiply the rounded numbers to get an estimated answer. Finally,
find the exact answer.
estimate exact
×
25.4
×2.8
Estimate: 90; exact: 71.12
Estimate: 9; exact: 7.112
Estimate: 9; exact: 7.212
Estimate: 90; exact: 72.12
395.3 + 0.28 + 47.83 + 75 + 8.1
The table shows Jose’s expenses for one month. Use the table to answer the question.
How much more did Jose spend on rent than on entertainment?
Monthly Expenses
Rent $480
Food $155
Car repairs, gas $101.57
Utilities $58.37
Phone (long distance) $63.28
Phone (local) $25.10
Drumming lessons $112
Entertainment $67.53
First, use front–end rounding to round each number and estimate the answer. Then, find the exact answer.
Chi bought 2 items at Lucky Pete’s market. She bought a pound of butter for $1.44 and a gallon of
milk for $3.15. What was the total amount that she paid for both of these items?
Estimate: $ 4; exact: $2.44
Estimate: $ 3; exact: $4.59
Estimate: $ 5; exact: $2.44
Estimate: $ 4; exact: $4.59
Decide if the answer is reasonable or unreasonable by rounding the numbers and estimating the answer. If the answer is
not reasonable, find the correct answer.
Unreasonable, should be 0.0998
Unreasonable, should be 99.8
Unreasonable, should be 0.998
Write the decimal as a fraction or mixed number in lowest terms.
The table shows Jose’s expenses for one month. Use the table to answer the question.
What were Jose’s total expenses for the month?
Monthly Expenses
Rent $557
Food $215
Car repairs, gas $98.56
Utilities $50.52
Phone (long distance) $62.05
Phone (local) $26.74
Drumming lessons $93
Entertainment $53.61
Round the number to the place indicated.
Round to the nearest thousandth: 55.7649
C
Write the decimal as a fraction or mixed number in lowest terms.
A grocer sold 11 melons for $1.01 each. What was the total amount of the sale?
Write the decimal as a fraction or mixed number in lowest terms.
Round the money amount to the specified place.
$2999.61 to the nearest dollar
A
Find the missing measurement in the figure.
a=1.25 in. b=1.25 in. c=5.6 in.
You are on a shopping trip. The store will round the amount you pay for each item to the nearest cent. Find the amount
you will pay.
Paper towels are 5 rolls for $20.88, so one roll is $4.1760. You pay:
D
Write the decimal as a fraction or mixed number in lowest terms.
Use front–end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer.
Finally, find the exact answer.
estimate exact
–
$71.90
– 7.19
Estimate: $63; exact: $64.71
Estimate: $73; exact: $74.85
Estimate: $73; exact: $73.75
Estimate: $63; exact: $64.81
Find the perimeter of (distance around) the given figure by adding the lengths of the sides.
Use front–end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer.
Finally, find the exact answer.
Estimate: 3; exact: 3.326
Estimate: 3; exact: 3.336
Estimate: 4; exact: 4.326
Estimate: 4; exact: 4.336
D)
Decide if the answer is reasonable or unreasonable by rounding the numbers and estimating the answer. If the answer is
not reasonable, find the correct answer.
Unreasonable, should be 351.7
Unreasonable, should be 3.517
Unreasonable, should be 0.3517
You are on a shopping trip. The store will round the amount you pay for each item to the nearest cent. Find the amount
you will pay.
Laundry detergent is 2 bottles for $4.25, so one bottle is $2.1250. You pay:
The table shows Jose’s expenses for one month. Use the table to answer the question.
How much more did Jose spend on food than on phone bills?
Monthly Expenses
Rent $513
Food $193
Car repairs, gas $96.72
Utilities $55.59
Phone (long distance) $84.03
Phone (local) $25.47
Drumming lessons $98
Entertainment $59.49
A person burns 7.1 calories per minute while walking. How many calories will be burned if the
person walks for 5 hours?
Use front–end rounding to round each number. Then, multiply the rounded numbers to get an estimated answer. Finally,
find the exact answer.
estimate exact
×
7.318
×2.05
Estimate: 14; exact: 15.0019
Estimate: 140; exact: 1500.19
Estimate: 140; exact: 150.019
Estimate: 1.4; exact: 1.50019
Arrange the group of numbers in order, from least to greatest.
1.954, 1.549, 1.594, 1.459
1.954, 1.594, 1.549, 1.459
1.954, 1.549, 1.594, 1.459
1.459, 1.594, 1.549, 1.954
1.459, 1.549, 1.594, 1.954
Write the decimal in numbers.
Seven thousand thirty and six hundredths
Simplify by using the order of operations. Round your answer to the nearest hundredth, if necessary.
An electrician has to choose different types of wire for different applications. The size of the
diameter of the wire is inversely related to the gauge of the wire. The chart below shows some
different gauges of wire and their approximate diameters. Use the chart to answer the question.
Write the diameter of 16 gauge wire in words and as a fraction.
Thirty–two thousandths inch; 32
1000 =4
125
Ninety–four thousandths inch; 94
1000 =47
500
Thirty–two ten–thousandths inch; 32
10,000 =2
625
Thirty–two hundredths inch; 32
100 =8
25
Use front–end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer.
Finally, find the exact answer.
estimate exact
+
1461.16
8114.31
+6901.07
Estimate: 16,000; exact: 16,376.54
Estimate: 15,000; exact: 15,476.54
Estimate: 15,000; exact: 15,376.54
Estimate: 16,000; exact: 16,476.54
A stockbroker bought 90 shares of stock for $16.88 each. What was the total amount of the
purchase?
Use front–end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer.
Finally, find the exact answer.
What is 8.027 grams from 822.2 grams?
Estimate: 792 grams; exact: 814.273 grams
Estimate: 792 grams; exact: 814.173 grams
Estimate: 792 grams; exact: 814.183 grams
Estimate: 892 grams; exact: 824.173 grams
Identify the digit with the given place value.
Write the decimal point in the correct location.
Suppose your job is to take phone orders for automotive parts. Use the table below to answer the
following questions. Write the correct part number that matches what you hear the customer say on
the phone.
Part
Number
Size in
inches
A
B
C
D
E
F
G
H
I
0.9
0.09
0.99
1.9
1.99
1.09
1.09
0.99
0.009
“We received all parts except the 1 and 9 hundredths size.”
Identify the digit with the given place value.
Even with most of the problem missing, it is possible to tell whether a suggested answer is reasonable. Determine
whether the answer given is reasonable. If it is unreasonable, move the decimal point or insert a decimal point to make
the answer reasonable.
How fast was he driving? 647 miles per hour
Unreasonable, should be 6.47 miles per hour
Unreasonable, should be 6470 miles per hour
Unreasonable, should be 64.7 miles per hour
Subtract 9.862 from 8933.46.
June has a strip of paper 45.5 inches long. She wants to cut it into strips that are 6.5 inches long.
How many 6.5–inch strips will she get from the paper?
D)
Decide if the answer is reasonable or unreasonable by rounding the numbers and estimating the answer. If the answer is
not reasonable, find the correct answer.
Unreasonable, should be 0.988
Unreasonable, should be 988
Unreasonable, should be 98.8
Write the decimal as a fraction or mixed number in lowest terms.
Round to the indicated place.
The average price of all new cars sold in the U.S. last year was $22,650.17. Round the price to the
nearest hundred dollars.
Write the fraction or mixed number as a decimal. Round to the nearest thousandth if necessary.
In order to prepare her budget, Sue gathers receipts for all major expenses she has had over the last month. Round the
figure to the nearest dollar.
C