Year 8 Unit 8: Ratio, Proportion and Compound Measures

Vocabulary flashcards covering metric conversions, ratio definitions, proportions, and compound measures from the Year 8 Unit 8 curriculum.

Metric units of length

The standard metric units used to measure distance, including $mm$, $cm$, $m$, and $km$.

Metric units of weight

The standard metric units used to measure mass, consisting of $g$ and $kg$.

Metric units of capacity

The standard metric units used to measure volume or liquid, consisting of $ml$ and $l$.

Area Conversion ($1\,\text{m}^2\text{ to cm}^2$)

To convert area from square meters to square centimeters, multiply by $100^2$, making $1\,\text{m}^2 = 10000\,\text{cm}^2$.

Volume Conversion ($1\,\text{m}^3\text{ to cm}^3$)

To convert volume from cubic meters to cubic centimeters, multiply by $100^3$, making $1\,\text{m}^3 = 1000000\,\text{cm}^3$.

Ratio

The relationship between two numbers.

Part

This is the numeric value ‘1’ of, would be equivalent to.

Simplify

To divide both parts of a ratio by the same number.

Equivalent

Equal in value.

Convert

To change from one form to another.

Unitary Method

A method used to calculate the value for a single item.

Best Value (Monetary)

A calculation used to find the cheapest option for a single item using the formula $\frac{\text{Price}}{\text{Quantity}}$.对外

Best Value (Recipe)

A calculation used to adjust ingredients based on the formula $\frac{\text{Ingredient amount}}{\text{Number of portions}}$.对外

Direct Proportion

Variables where the ratio is constant between the quantities.

Inverse Proportion

Variables where one quantity increases in proportion to the other decreasing.

Speed

A compound measure calculated using the formula $\frac{\text{Distance}}{\text{Time}}$.对外

Pressure

A compound measure calculated using the formula $\frac{\text{Force}}{\text{Area}}$.对外

Density

A compound measure calculated using the formula $\frac{\text{Mass}}{\text{Volume}}$.对外