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Middle School Math
Matemáticas
Middle School Math
Decimales

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Name _____________________________
Date ___________________
Decimales
Compare. Escribe <, >, o =.
1.  
3.2570  _______  3.7250
2.  
9.87  _______  9.870
3.  
2.520  _______  2.52
4.  
0.0004  _______  0.00190
5.  
8.01  _______  7.9
6.  
12.5218827  _______  12.52185250
7.  
8.296270  _______  8.797083
8.  
10.18  _______  10.1

Compare. Escribe <, >, o =.
9.  
-10.220  _______  -10.17
10.  
-0.18  _______  -0.130
11.  
-12.52  _______  -12.520
12.  
2.3216  _______  -2.6231
13.  
-11.661840  _______  -11.663630
14.  
-3.28  _______  -3.2
15.  
-1.3480  _______  1.348
16.  
-6.004  _______  -6.000015

Ordene los decimales de menos a más.
17.  32.37,32.23,32.19,32.1,32.41,32.31
18.  9.36079,9.63,9.248,9.10,9.1103
19.  57.60,57.00060,57.0060,57.060
20.  96.27,96.27,96.2

Ordene los decimales de menos a más.
21.  -95.74,-95.44,-95.18,-95.25,-95.23
22.  -77.00694,-77.60094,-77.0694,-77.06094,77.0006094
23.  66.10,66.169,66.44
24.  -0.2,-0.1,-0.11,-0.211

Suma o resta.
25.  27  -  24.3
26.  30.31  -  26.13
27.  22.0009913  -  11.006742
28.  24.6972  +  25.8088

Key #2
Vuelve a escribir el número en notación científica.
29.  0.0000000004
30.  0.000000093
31.  475,000,000
32.  0.00000000331
33.  7,300,000
34.  23,900,000
35.  0.00000000000477
36.  0.0008

Vuelve a escribir el número en notación decimal.
37.  6.53 x 10-9
38.  8 x 10-7
39.  8.7 x 1012
40.  7.4 x 104
41.  9.32 x 109
42.  1.17 x 10-12
43.  4.22 x 1010
44.  3.41 x 10-8

Resuelve la incógnita.
45.  49.002575463 = 20.000161523  +  m
46.  11.32  -  a = 2.005
47.  e  +  21.5 = 45.1
48.  29.23573  +  s = 50.23573

Multiplica. Redondea las respuestas a las más próximas unidades de millar.
49.  7.83  x  7.1428
50.  2.0042
51.  1.09  x  5.0060
52.  0.4960  x  2
53.  2.0084  x  2.001
54.  2.20  x  12.78

Completa.
55.  Emily measured the length of her iguana last month and found it was31.7centimeters long. She measured it again today and found that some of its tail was missing and now it was only 30.54 centimeters long. By how much was the iguana shorter?

56.  A new element has been discovered on planet Q—Blutonium. Blutonium is quite dense (55g/cm3) and very rare. It is worth93.9million dollars a gram. It cost the local laboratory1.3million dollars to purchase a sample of the new element. What was the volume of the piece of Blutonium the lab purchased? Round your answer to the nearest ten-thousandth of a cm3. (hint: volume = mass / density)


Key #2
Divide.
57.  12.1  ÷  16
58.  4.73  ÷  2
59.  9.2377  ÷  4
60.  2.59  ÷  5
61.  5.0085  ÷  9
62.  3.44  ÷  2

Divide.
63.  38.4391  ÷  10.9826
64.  32.19  ÷  3.7
65.  122.88  ÷  9.6
66.  20.2944  ÷  8.456
67.  52.53  ÷  5.1
68.  22.77  ÷  2.3

Completa.
69.  
19.7 + -12
70.  
-4 + 18 ÷ 6
71.  
-7.3 +  (8 × 9.1 - -8.9 + -27
72.  
8.4 +  (-39 × 1.7 + 28 + 19.5
73.  
46 ÷ -23 - 16.1 × -7
74.  
-31 + 11.1

Resuelve.
75.  71.54 = 14y
76.  r  ÷  9.79 = 11.4
77.  119.6 = 10.4d
78.  39.48 = 4.7j
79.  9.2 = b  ÷  10.2
80.  1.48 = q  ÷  5
81.  18 = 8w
82.  0.257 = h  ÷  12
83.  2.195 = b  ÷  2
84.  a  ÷  12.75 = 3.6
85.  w  ÷  6.4 = 6.6
86.  7.3 = j  ÷  11.7

Completa.
87.  They keep a few fish in the science lab at Bigtowm Junior High. If the temperature in the lab aquarium dropped6% from its normal79F, what would the temperature be?

88.  Many chemical reactions produce heat. Suppose you are conducting an experiment involving a chemical reaction and the temperature begins to rise. It rises at a rate of3.4C per minute. What will the reaction temperature be in16minutes if the temperature now is15C?


Key #2
Completa.
89.  Many small algae are approximately spherical in shape. Professor Glump has made it his life's work to catalog and compare all the spherical algae in the world. He is studying two newly discovered species that differ in diameter by a 1.2 x 10-5m. If the larger of the two species has an average diameter of0.00072m, what is the average diameter of the smaller species? Express your answer using scientific notation.

90.  Alyssa is observing some rather small bacteria using an electron microscope. She sees that these particular bacteria grow in chains with each cell being about 3 x 10-6m in length. If the average chain length is6cells long, on average how long is each chain of cells?


Compare. Escribe <, >, o =.
91.  
7.59  _______  7.40
92.  
8.7699114  _______  8.7699511
93.  
10.16  _______  10.320
94.  
0.240  _______  0.240
95.  
3.0013  _______  3.0003
96.  
6.410  _______  6.410
97.  
11.8  _______  11.70
98.  
2.9190  _______  2.1270

Resuelve la incógnita.
99.  21.61  -  r = 8.81
100.  51.637 = m  +  23.231
101.  6.2 = z  -  12.7
102.  18.49 = 8.27  +  x

Completa.
103.  Give two decimals whose product is 79.299 and whose difference is 0.01.





104.  ¿Cuál es más fácil, convirtiendo 0.5a una fracción o convertirfive-seventhsa un decimal?







Answer Key


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suscriptores de edHelper - Cree un imprimible nuevo
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Middle School Math
Matemáticas
Middle School Math
Decimales

This worksheet still contains English.
edHelper is working on the translation