Decimal x Decimal
Decimal x Whole #
Estimating
Terrible 2's
Can you handle it?
100
0.6 x 0.5
0.3
100
2.7 x 6
16.2
100
Estimate 8.7 x 2.3
27
100
2.22 x 22.2
49.284
100
An 8-gigabyte memory card costs $34.99. If Francis bought 3 memory cards, what is the estimated total cost?
$105
200
1.4 x 2.56
3.854
200
3 x 0.02
0.06
200
Estimate 26.3 x 9.7
260 (6 x 10)...250 will also be accepted.
200
Josh bought 2 shirts for $14.98 each and 2 pairs of socks for $2.14 cents each. How much money did he spend all together?
$34.24
200
The height of Mount Everest, in meters, can be found by multiplying 8.85 by 1,000. Find the height of Mount Everest.
8,850
300
2.7 x 1.35
3.645
300
3 x 0.5
1.5
300
Mario and Andrew earned the following for mowing lawns: Mario: $8.25 per hour Andrew: $5.85 per hour If each boy worked 20 hours, ABOUT how much more money did Mario earn?
$40
300
Milk costs $2.29 per gallon. What would be the total cost if Kelley and Bob each purchased 2 gallons of milk?
$9.16
300
The length of a pool table is 7.1 feed and the width is 3.6 feet. Find the area of the surface of the pool table.
25.56 sq. ft.
400
A mile is equal to aproximately 1.609 kilometers. How many kilometers is 2.5 miles?
4.0225 km
400
Asher recently recieved a poster that has a width of 4 feet and a length of 3.2 feet. What is the area of the poster?
12.8 ft.
400
Cupcakes are on sale for $2.99 for 4. If Rachel purchased 12 cupcakes, ABOUT how much money did she spend?
$9
400
The school store is selling the following items: Tiger Notebook: $2.49 Bumper Sticker: $1.79 Tiger Paw Magnet: $0.89 If Kristin buys 2 notebooks, 2 bumper stickers, and 2 magnets, how much will she spend for all of the items?
$10.34
400
2839.2 x 1983.12
5630474.304
500
A giraffe can run up to 46.93 fee per second. How far could a giraffe run in 1.8 seconds?
84.474
500
0.0198 x 75
1.485
500
Patty has $25 to buy Valentine's day chocolate for all of her friends. She found chocolate hearts that cost $5.15 each. If she needs to purchase 6 of them, does she have enough money?
No. Even though $4.15 would round down to 5 and 5 x 6 = 30, we have to round up to make sure we have enough. 6 x 6 is $36, and $5.15 x 5 is $30.90.
500
Solve the following problem: 2.2 x 2.22 x 0.2
.9768
500
Armando and his 3 friends ordered a 4-foot sub for $25.99, 4 large drinks for $1.79 each, and a salad for $5.89. What is the total cost, not including tax?
$39.04
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