HMH7 Mod 5 Multiply and Divide Rational Numbers

Front

What is a rational number?

Back

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

Front

How do you multiply two rational numbers?

Back

To multiply two rational numbers, multiply their numerators together and their denominators together. For example, (a/b) * (c/d) = (a*c)/(b*d).

Front

What is the process for dividing rational numbers?

Back

To divide rational numbers, multiply by the reciprocal of the divisor. For example, (a/b) ÷ (c/d) = (a/b) * (d/c) = (a*d)/(b*c).

Front

What does it mean to find the change in percentage?

Back

Finding the change in percentage involves calculating the difference between two percentages and expressing it as a percentage of the original value.

Front

If Danny earned 85% and missed 3 questions, what is the change in score per question?

Back

The change in score per question is -5%.

Front

How do you calculate the change in memory used on a device?

Back

To calculate the change in memory, subtract the final memory percentage from the initial memory percentage and divide by the number of items (videos, in this case).

Front

What is the formula for percentage change?

Back

Percentage change = (New Value - Old Value) / Old Value * 100.

Front

What is the significance of a negative percentage change?

Back

A negative percentage change indicates a decrease in value, such as a loss of memory or a drop in score.

Front

How can you express a percentage as a decimal?

Back

To express a percentage as a decimal, divide the percentage by 100. For example, 85% = 0.85.

Front

What is the relationship between fractions and rational numbers?

Back

All fractions are rational numbers, but not all rational numbers are fractions. Rational numbers can also be expressed as terminating or repeating decimals.