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Middle School Math
Mathématiques
Middle School Math
Nombres décimaux

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Name _____________________________
Date ___________________
Nombres décimaux
Compare. Ecris <, > ou =.
1.  * Cette fiche est prête à l'emploi.
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2.  
0.30  _______  0.300
3.  
11.56  _______  11.5
4.  
2.39473  _______  2.61834
5.  
10.18  _______  10.170
6.  
9.286  _______  9.6280
7.  
3.696487  _______  3.696525
8.  
1.4913  _______  1.1349

Compare. Ecris <, > ou =.
9.  
-3.68910  _______  -3.91680
10.  
-10.30  _______  -10.40
11.  
-4.56  _______  4.56
12.  
-5.16  _______  -5.160
13.  
-7.87  _______  -7.870
14.  
-2.558  _______  -2.439
15.  
-0.17  _______  -0.11
16.  
-12.000010  _______  -12.0000100

Classe les nombres décimals par ordre croissant.
17.  46.711,46.92,46.9,46.1,46.16,46.7
18.  55.55,55.11,55.54
19.  13.57,13.5,13.314,13.2,13.3,13.215
20.  93.18,93.22,92.8,92.93,93.09

Classe les nombres décimals par ordre croissant.
21.  -58.645,-58.677,-58.908,-58.957
22.  -88.2,-88.213,-88.3,-88.33
23.  -13.06009,-13.00069,-13.6009,-13.00609,-13.0006009
24.  -57.541,-57.74,-57.2

Additionne ou soustrais.
25.  29.16  -  18.18
26.  26.817  +  28.82
27.  20.34  -  9.3
28.  13.6  +  24.28

Key #2
Réécris le nombre en notation scientifique.
29.  0.0000000066
30.  30,000,000
31.  712,000
32.  0.0000000704
33.  6,870,000,000,000
34.  0.0000000000021
35.  8,000,000,000
36.  0.000759

Réécris le nombre en forme décimale.
37.  6.57 x 106
38.  3.63 x 104
39.  5 x 10-11
40.  8.6 x 10-8
41.  3.7 x 10-9
42.  2.09 x 107
43.  4.91 x 10-12
44.  5.71 x 109

Résous pour l'inconnu.
45.  f  -  3 = 4.6382
46.  23.0062561  +  s = 39.0230371
47.  37.099094 = 17.753934  +  u
48.  30.58  -  r = 20.33

Multiplie. Arrondis les réponses au millième le plus proche.
49.  0.738  x  14
50.  6.070  x  1.07
51.  2.008  x  4.00075
52.  2.958  x  5.5465
53.  11.3402
54.  4.60  x  7.337

Complète.
55.  A new element has been discovered on planet Q—Blutonium. Blutonium is quite dense (48g/cm3) and very rare. It is worth92.4million dollars a gram. It cost the local laboratory2.7million 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)

56.  A crate of petrified wood recently sold at the local auction. There were about twenty-seven pieces and the total weight of the pieces was287.69pounds. What was the average weight per piece? Round your answer to two decimal places. _________ pounds


Key #2
Divise.
57.  7.527  ÷  2
58.  5.52  ÷  3
59.  8.9  ÷  20
60.  10.6211  ÷  7
61.  2.0007  ÷  9
62.  11.621  ÷  4

Divise.
63.  13.5711  ÷  2.661
64.  50.05  ÷  5.5
65.  28.489  ÷  9.19
66.  94.71  ÷  7.7
67.  39.14  ÷  3.8
68.  60.97875  ÷  8.8375

Complète.
69.  
54 ÷ 3 + 31
70.  
-13 + 15.4
71.  
24 +  (16 + 54.6 ÷ 7.8 × -10.3
72.  
1.9 + -1 - 34 × 48
73.  
43 - -437.1 ÷ -31 - 44 + -9.3
74.  
-21 - 78 ÷ -5.2

Résous.
75.  10.6y = 75.26
76.  6.568q = 71.32848
77.  75.24 = 7.6s
78.  z  ÷  3 = 3.253
79.  4.36h = 19.8816
80.  d  ÷  5.5 = 8.4
81.  31.64 = 2.8e
82.  w  ÷  3.1 = 5.3
83.  2.125 = p  ÷  4
84.  37.23 = 3r
85.  f  ÷  2.4 = 11.6
86.  82.81 = 13n

Complète.
87.  A 10-kg ball of iron is put in a freezer at-65.7C pour48hours. Then it is removed and put in an oven to undergo a mechanical test. Over the course of the test the temperature rises. At the end of the test, the temperature of the ball is212.3C. What was the temperature change?

88.  If you consult a periodic table of the elements you will see that the atomic number of helium is2. Thus, every helium atom has2protons. How many protons are there in a collection of 1.876 x 108helium atoms? Express your answer in scientific notation.


Key #2
Complète.
89.  Nanotechnology is an exciting field concerned with very tiny machines. A new technique pioneered by Small World, Inc., can produce some exceedingly small levers that are triangular in shape. The new nanotriangles are right triangles with a base of130nm and a height of50nm. What is the area (in m2) of such a small triangle? Express you answer using scientific notation.

90.  Some chemical compounds are so hard to make in the lab that they can only be synthesized in tiny amounts. Professor Sneed has succeeded in making about30picograms of californium hexachloride, an extremely radioactive and unstable compound. After 12 hours, only15% of the compound remains. How much is left? Express your answer in scientific notation and in grams.


Classe les nombres décimals par ordre croissant.
91.  -60.474,-60.836,-60.575,-60.571,-60.197
92.  -89.6,89.44,-89.62,-89.75,89.3
93.  -73.040003,-73.0004003,73.004003,73.0043,-73.00043,-73.00040003
94.  -53.8,-53.83,-54.03,-54.15,-53.85

Divise.
95.  10.5  ÷  8
96.  3.4314  ÷  2
97.  2.000936  ÷  7
98.  12.15  ÷  18
99.  11.572  ÷  2
100.  7.84  ÷  4

Complète.
101.  
Write three decimals greater than   
1

6
et plus petites que 1.





102.  Ecris une procédure étape par étape pour convertir une fraction à son équivalent en forme décimale. N'oubiel pas d'expliquer que faire si le résultat est une décimale à répétition.







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Middle School Math
Mathématiques
Middle School Math
Nombres décimaux

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