Estimating
Decimals
Multiplying with
0.1 and 0.01 and 0.001
Decimal
x
Whole
Decimal
x
Decimal
ULTIMATE
CHALLENGE!!!
(only 500)
100

Liam has a rug that has a length of 3 centimeters and a width of 13.41 centimeters. She wants to know what the approximate area is. What is a approximate are? Use nearest WHOLE NUMBER.

39 cm

If no unit, no point.

100

0.32 X 8 X 0.1

0.256

100

2.3 X 4

9.2

100

3.6 X 6.7

24.12

200

4.57 X 16.73

Use nearest TENTH

76.82

200

2.49 X 13 X 0.1

3.237

200

2.14 X 4

8.56

200

13.3 X 7.27

96.691

300

3.42 X 2.68= ?

Use whatever

Whole:9

Tenth:9.18

Compatible:12.25

300

128 X 0.1 X 0.01

0.128

300

8.18 X 17

139.06

300

12.85 X 14.25

183.1125

400

Tina's tiled floor has square tiles with a side length of 3.45 inches. If she was to calculate the approximate area of 9 tiles, what would the approximate area be? Use nearest tenth

110.25 inches

No unit, no point

400

2941 X 0.001

2.941

400

13.92 X 9

125.28

400

Amelia wants a dog bed for her dog. She used blankets to scale how big the bed needs to be. Her dog could not fit on a 4.5 by 3.1 inch blanket, but can fit on a 6.2 by 3.6 blanket. She also tested what her dog would hang out on more. Based on the results, her dog liked a 5.2 by 3.2 and a 5.7 by 3.4. Based on the data, what would Amelia's dog like the most?

Options: Width= 5.2-5.7  

Length= 3.2-3.4

500

A bakery uses 12.7 pounds of flour to make one large batch of bread. Each batch requires about 0.85 times as much flour as the bakery originally planned to use. About how many pounds of flour will the bakery use for one batch? Estimate by rounding each factor to a whole number. Find the exact product. Explain whether your estimate is greater than or less than the exact answer.

Estimate:13   Exact:10.795

Estimate is Greater

500

19462 X 0.1 X 0.01

19.462

500

3.271 X 7

22.897

500

A rectangular pool is 6.4 meters long and 3.75 meters wide.The pool is being covered with a special water-resistant coating. Each square meter of the pool requires 0.8 liters of coating.How many liters of coating are needed to cover the entire pool?

19.2 liters

If no unit or wrong unit, no points

500

1.255 X 3.50 X 15.8 + 0.0145= ?

69.416

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