Express 0.00045 in standard form.

Answer and explanation

Correct answer: B. 4.5 x 10^-4

  1. Step 1: Move the decimal point four places right to get 4.5. Step 2. So 0.00045 = 4.5 x 10^-4. Answer: 4.5 x 10^-4. Why not the others: 4.5 x 10^-3: The decimal point moves four places, not three. 45 x 10^-5: A number in standard form must lie between 1 and 10. 4.5 x 10^4: The power must be negative for a number smaller than 1.

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Express 0.00045 in standard form. | Kenya KCSE