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Grade:
7
, Subject:
Math
, Topic:
Multiplication and divison of numbers written in Scientific Nota
Question 1:
(1.4 × 10
6
) × (1.2 × 10
3
) = __
?
__
2.6 × 10
9
2.6 × 10
4
1.7 × 10
9
1.7 × 10
18
Question 2:
(4.5×10
5
) ÷ (1.5×10
3
) = __
?
__
3 × 10
8
3 × 10
2
3 × 10
15
3 × 10
4
Question 3:
(2 × 10
3
)(3 × 10
4
) = __
?
__
5 × 10
7
6 × 10
1
6 × 10
12
6 × 10
7
Question 4:
The smallest known star in the universe is OGLE-TR-122b. It has a diameter of 8.29 × 10
3
km. The largest known star in the universe, VY Canis Majoris, is about 1.67 × 10
5
times larger than OGLE-TR-122b. What is the diameter of VY Canis Majoris?
2.38 × 10
9
km
1.38 × 10
9
km
1.38 × 10
11
km
7.3 × 10
7
km
Question 5:
There are 3.2×10
8
virus in a sample vile. How many total number of virus will there be in 5,000 such vile?
16×10
8
16.0×10
12
1.6×10
12
1.6×10
11
Question 6:
= __
?
__
4 × 10
7
4 × 10
12
4 × 10
−1
4 × 10
1
Question 7:
Find the quotient.
360,000,000 ÷ 0.0008
4.5 × 10
10
4.5 × 10
11
4.5 × 10
12
4.5 × 10
9
Question 8:
Size of a Helium atom is 62 pico meter. If 10
5
Helium atoms are placed in a straight line, how long line will it make? (1 pico meter = 10
−12
meter)
6.2 × 10
−17
meter
6.2 × 10
−7
meter
62 × 10
−6
meter
6.2 × 10
−6
meter
Question 9:
Weight of a Hydrogen atom is 1.66 × 10
−27
kg. How many Hydrogen atoms are there in a container that has 8.3 × 10
−3
kg of Hydrogen?
5 × 10
24
atoms
5 × 10
−24
atoms
5 × 10
27
atoms
5 × 10
30
atoms
Question 10:
(2 × 10
-3
) (2 × 10
8
) = __
?
__
4 × 10
5
4 × 10
11
4 × 10
−5
4 × 10
6
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