Question

# Express the following numbers in standard form: (i) 6020000000000000 (ii) 0.00000000000943 (iii) 0.00000000085 (iv) 846 × 107 (v) 3759 × 10−4 (vi) 0.00072984 (vii) 0.000437 × 104 (viii) 4 ÷ 100000

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Solution

## To express a number in the standard form, move the decimal point such that there is only one digit to the left of the decimal point. (i) 6020000000000000 = 6.02 x 1015 (The decimal point is moved 15 places to the left.) (ii) 0.0000000000943 = 9.43 x 10−12 (The decimal point is moved 12 places to the right.) (iii) 0.00000000085 = 8.5 x 10−10 (The decimal point is moved 10 places to the right.) (iv) 846 x 107 = 8.46 x 102 x 107 = 8.46 x 109 (The decimal point is moved two places to the left.) (v) 3759 x 10−4 = 3.759 x 103 x 10−4 = 3.759 x 10−1 (The decimal point is moved three places to the left.) (vi) 0.00072984 = 7.984 x 10−4 (The decimal point is moved four places to the right.) (vii) 0.000437 x 104 = 4.37 x 10−4 x 104 = 4.37 x 100 = 4.37 (The decimal point is moved four places to the right.) (viii) 4/100000 = 4 x 100000−1 = 4 x 10−5 (Just count the number of zeros in 1,00,000 to determine the exponent of 10.)

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