To divide fractions, invert the second fraction and then multiply:

\( \frac{2}{6} \) ÷ \( \frac{4}{7} \) = \( \frac{2}{6} \) x \( \frac{7}{4} \)

To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{2}{6} \) x \( \frac{7}{4} \) = \( \frac{2 x 7}{6 x 4} \) = \( \frac{14}{24} \) = \(\frac{7}{12}\)

To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:

4a⁵ - 6a⁵
(4 - 6)a⁵
-2a⁵

The factors of a number are all positive integers that divide evenly into the number. The factors of 20 are 1, 2, 4, 5, 10, 20.

The commutative property states that, when adding or multiplying numbers, the order in which they're added or multiplied does not matter. For example, 3 + 4 and 4 + 3 give the same result, as do 3 x 4 and 4 x 3.

A number in scientific notation has the format 0.000 x 10^exponent. To convert to scientific notation, move the decimal point to the right or the left until the number is a decimal between 1 and 10. The exponent of the 10 is the number of places you moved the decimal point and is positive if you moved the decimal point to the left and negative if you moved it to the right:

2,946,000 in scientific notation is 2.946 x 10⁶