Question

Simplify 0.00021 * 0.000028 and Express your answer in standard form(scientific notation) ​

Answer 1

Answer: 2.1×10⁻4 and 2.8×10⁻5

Explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10

. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive. 2.1×10⁻4

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10

. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive. 2.8×10⁻5

Answer 2

=58.8*10⁻⁴

Explanation:

0.00021 * 0.000028 = 210*10⁻⁶ * 28*10⁻⁶

= (210*28)10⁻⁶

= 5880*10⁻⁶

= 58.8 * 10⁻⁴