Topic 4: Ratio, Proportion and Rates of Change

• Significant Figures- The digits that give the most meaning to a number
• Upper Bound- The lowest number that will not round to the given number
• Lower bound- The lowest number that does round to the given number
• Direct proportion- The link between two quantities whose ratio is constant. The graphs always go through (0,0)
• Indirect proportion- The link between two quantities where if one quantity increases, the other decreases