SCIENTIFIC NOTATION PRACTICE QUESTIONS

Question 1 :

Write the given number in scientific notation. 

0.00006

Question 2 :

Write the given number in scientific notation. 

5400000

Question 3 :

Write the given number in scientific notation. 

71 x 10²

Question 4 :

Write the given number in scientific notation. 

33 x 10^-3

Question 5 :

Write the given number in scientific notation. 

0.63 x 10^-3

Question 6 :

Write the given number in scientific notation. 

0.000216

Question 7 :

Write the given number in scientific notation. 

0.0000009

Question 8 :

Write the given number in scientific notation. 

804 x 10²

Question 9 :

Write the given number in scientific notation. 

4.8

Question 10 :

Write the given number in scientific notation. 

0.99 x 10

Detailed Answer Key

Question 1 :

Write the given number in scientific notation. 

0.00006

Answer :

Here, decimal point comes first at non zero digit comes next. 

We have to move the decimal point to the right. 

Number of digits from the decimal point up to the first non zero digit is 5.

So, the decimal point has to be moved 5 digits to the right and exponent of 10 should be -5 (negative integer)

Therefore, the scientific notation of 0.00006 is

6 x 10^-5

Question 2 :

Write the given number in scientific notation. 

5400000

Answer : 

Here, we don't find decimal point in 5400000. So we have to assume that there is decimal point at the end . 

Then, 5400000 ---------> 5400000.

Here, non zero digit comes first and decimal point comes next. 

We have to move the decimal point to the left. 

Number of digits between the first non zero digit and the decimal point is 6.

So, the decimal point has to be moved 6 digits to the left and exponent of 10 should be 6 (positive integer)

5400000  =  5.400000 x 10⁶

5400000  =  5.4 x 10⁶

Therefore, the scientific notation of 5400000 is

5.4 x 10⁶

(Here zeros after the decimal point are not taken. Because, they are not valid zeros)

Question 3 :

Write the given number in scientific notation. 

71 x 10²

Answer : 

Here, we don't find decimal point in 71x 10². So we have to assume that there is decimal point at the end of 71 

Then, 

71 x 10² ---------> 71. x 10²

Here, non zero digit comes first and decimal point comes next. 

We have to move the decimal point to the left. 

Number of digits between the first non zero digit and the decimal point is 1.

So, the decimal point has to be moved 1 digit to the left and exponent of 10 should be 1 (positive integer)

71. x 10² = 7.1 x 10¹ x 10²

71

Therefore, the scientific notation of 71 x 10² is

7.1 x 10³

Question 4 :

Write the given number in scientific notation. 

33 x 10^-3

Answer : 

Here, we don't find decimal point in 33 x 10^-3 So we have to assume that there is decimal point at the end of 33 

Then, 

33 x 10^-3 ---------> 33. x 10^-3 

Here, non zero digit comes first and decimal point comes next. 

We have to move the decimal point to the left. 

Number of digits between the first non zero digit and the decimal point is 1.

So, the decimal point has to be moved 1 digit to the left and exponent of 10 should be 1 (positive integer)

33. x 10^-3  = 3.3 x 10¹ x 10^-3

33. x 10^-3  = 3.3 x 10^-2

Therefore, the scientific notation of 33 x 10^-3 is

3.3 x 10^-2

Question 5 :

Write the given number in scientific notation. 

0.63 x 10^-3

Answer : 

Here, decimal point comes first and non zero digit comes next. 

We have to move the decimal point to the right. 

Number of digits from the decimal point up to the first non zero digit is 1.

So, the decimal point has to be moved 1 digit to the right and exponent of 10 should be -1 (negative integer)

0.63 x 10^-3  =  6.3 x 10^-1 x 10^-3

0.63 x 10^-3  =  6.3 x 10^-4

Therefore, the scientific notation of 0.63 x 10^-3 is

6.3 x 10^-4

Question 6 :

Write the given number in scientific notation. 

0.000216

Solution : 

Here, decimal point comes first and non zero digit comes next. 

We have to move the decimal point to the right. 

Number of digits from the decimal point up to the first non zero digit is 4.

So, the decimal point has to be moved 4 digits to the right and exponent of 10 should be -4 (negative integer)

0.000216   =  2.16 x 10^-4

Therefore, the scientific notation of 0.000216 is

2.16 x 10^-4

Question 7 :

Write the given number in scientific notation. 

0.0000009

Solution : 

Here, decimal point comes first and non zero digit comes next. 

We have to move the decimal point to the right. 

Number of digits from the decimal point up to the first non zero digit is 7.

So, the decimal point has to be moved 7 digits to the right and exponent of 10 should be -7 (negative integer)

0.0000009   =  9 x 10^-7

Therefore, the scientific notation of 0.0000009 is

9 x 10^-7

Question 8 :

Write the given number in scientific notation. 

804 x 10²

Solution : 

Here, we don't find decimal point in 804 x 10². So we have to assume that there is decimal point at the end . 

Then, 

804 x 10² ---------> 804. x 10²

Here, non zero digit comes first and decimal point comes next. 

We have to move the decimal point to the left. 

Number of digits between the first non zero digit and the decimal point is 2.

So, the decimal point has to be moved 2 digits to the left and exponent of 10 should be 2 (positive integer)

804. x 10² =  8.04 x 10² x 10²

804. x 10² =  8.04 x 10⁴

Therefore, the scientific notation of 804 x 10² is 

8.04 x 10⁴

Question 9 :

Write the given number in scientific notation. 

4.8

Solution : 

Here, the given number is almost in scientific notation.

Because there is only one non zero digit before the decimal point.

We don't have to move the decimal point either to the left or right.

Then, exponent of 10 should be zero.

4.8  =  4.8 x 10⁰

Therefore, the scientific notation of 4.8 is

4.8 x 10⁰

Question 10 :

Write the given number in scientific notation. 

0.99 x 10

Answer : 

Here, decimal point comes first and non zero digit comes next. 

We have to move the decimal to the right. 

Number of digits from the decimal point up to the first non zero digit is 1.

So, the decimal point has to be moved 1 digit to the right and exponent of 10 should be -1 (negative integer)

0.99 x 10¹  =  9.9 x 10^-1 x 10¹

0.99 x 10¹  =  9.9 x 10^-1+1

0.99 x 10^-1  =  9.9 x 10⁰

Therefore, the scientific notation of 0.99 x 10^-1 is

9.9 x 10⁰

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