Th e reverse process of converting a number in scientifi c notation to the decimal form is easily done when the following steps are followed:
(i) Write the decimal number.
(ii) Move the decimal point by the number of places specified by the power of 10, to the right if positive, or to the left if negative. Add zeros if necessary.
(iii) Rewrite the number in decimal form.
Example 1 :
Write the following numbers in decimal form:
(i) 3.459 x 106
Solution :
3.459 x 106
Since we have positive sign for the power of 10, we have to the move the decimal point 6 digit to the right side.
= 3459000
(ii) 5.678 104
Solution :
Since we have positive sign for the power of 4, we have to the move the decimal point 4 digit to the right side.
= 56780
(iii) 1.00005 x 10-5
Solution :
Since we have negative sign for the power of 5, we have to the move the decimal point 5 digit to the left side.
= 0.0000100005
(iv) 2.530009 x 10-7
Solution :
Since we have negative sign for the power of 7, we have to the move the decimal point 7 digits to the left side.
= 0.0000002530009
Example 2 :
Represent the following numbers in scientific notation:
(i) (300000)2 x (20000)4
Solution :
= (300000)2 x (20000)4
= (3.0 x 105)2 x (2.0 x 104)4
= 32 x 1010 x 24 x 1016
= 144 x 1010+16
= 1.44 x 102 x 1010+16
= 1.44 x 1028
(ii) (0.000001)11 ÷ (0.005)3
Solution :
= (0.000001)11 ÷ (0.005)3
= (1 x 10-6)11 ÷ (5 x 10-3)3
= (1/125) x 10-66 x 109
= 0.008 x 10-66+9
= 8 x 10-3 x 10-57
= 8 x 10-57-3
= 8 x 10-60
(iii) {(0.00003)6 x (0.00005)4} ÷ {(0.009)3 x (0.05)2}
Solution :
= {(0.00003)6 x (0.00005)4} ÷ {(0.009)3 x (0.05)2}
= {(3x10-5)6 x (5x10- 5)4} ÷ {(9x10-3)3 x (5x10-2)2}
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