Lesson 9
Comparing and Rounding Decimals
Comparing and Rounding Decimals
Which number in standard form is equivalent to 0.15 x 10^3?
150
Sabrina and Chris are running in a relay. Sabrina runs 100 meters in 13.6b seconds. Christie runs the same distance in 12.2 seconds. What is their total time?
25.8 seconds
The mass of a female hummingbird is 4.5 grams. The mass of a male himmingbird is 3.2 grams. What is the difference between the masses of the female and male hummingbirds?
1.3 grams
Naeem needs 1/4 cup of milk to make a carrot cake. He also needs 1/8 cup of milk to make the icing for the cake. What fraction of a cup of milk does Naeem need in all?
3/8 cup
Paul has a 3/4 inch bolt. He buys a bolt that is 1/8 inch longer and a bolt that is 1/8 inch shorter than the 3/4 inch bolt. What are the lengths of the two bolts?
Longer bolt: 7/8 inch
Shorter bolt: 5/8 inch
The driving distance between Buffalo, NY and Rochester, NY is 117.456 kilometers. What is the distance rounded to the nearest tenth of a kilometer?
117.5 kilometers
Manny and Soo went mountain biking. They biked 15.36 kilometers on the red trail and then rode 13.5 kilometers on the blue trail. What was the total distance they biked?
28.86 kilometers
Tamara caught a fish that weighs 5.6 pounds. Victoria caught a fish that weighs 3.4 pounds. What is the difference between the weights of the fish?
2.2 pounds
Maggie paddles her kayak 1/2 mile to an island. Then she paddles 4/5 mile to a beach. How far does Maggie paddle her kayak in all?
1 3/10 miles
Gavin has 2/3 pint of water left in his water bottle. He drinks 1/2 pint. How much water is left in the bottle now?
1/6 pint
Ian and Rosa race in a speed skating competition. Ian records a time of 42.839 seconds. Rosa records a time of 42.782 seconds. True or False, rounded to the nearest tenth of a second, the times are equal?
True
From his home, Tim rides the bus 3.82 miles. Then he walks 0.4 miles from the bus stop to school. How many miles does Tim travel from home to school?
4.22 miles
Marty eats 2.05 ounces of cheese from a 4.6 ounce block of cheddar cheese. How many ounces of cheddar cheese are left?
2.55 ounces
Hank practices 5/8 of his spelling words on Monday. He practices another 1/4 of his spelling words on Tuesday. What fraction of his spelling words has Hank practiced so far?
7/8
7 3/5 - 9/10=?
6 7/10
Tyson runs in a race at a track meet. One stopwatch shows his time as 11.25 seconds. Another stopwatch shows his time as 11.245 seconds. What is the answer if you round each time to the nearest tenth of a second?
11.25 rounds to 11.3
11.245 rounds to 11.2
Yana makes a trail mix with 6.25 ounces of dried fruit and 1.8 ounces of sunflower seeds. How many ounces of trail mix does Yana make?
8.05 ounces
Anya has $3.07 in her change purse. She spends $1.15 on snacks at the vending machine. How much money does Anya have left?
$1.92
1 2/3 + 3/4= ?
2 5/12
3 3/8 - 1 3/4=?
1 5/8
What is 12.345 rounded to the nearest hundredth?
12.35
What is 11.54+1.25+0.16=?
12.95
What is 3.31-1.24?
2.07
11/8 + 5/6=?
2 5/24
The first chapter of Henry's book is 5 2/3 pages long. The second chapter is 8 2/5 pages long. How much longer is the second chapter than the first chapter?
2 11/15