Comparing Ratios Demonstration This resource provides animated demonstrations

Comparing Ratios – Demonstration This resource provides animated demonstrations of the mathematical method. Check animations and delete slides not needed for your class.

Anna & George both have pink and blue sweets in the same ratio. : If Anna has these sweets… How many blue sweets does George have? 1 pink : 2 blue 4 : 8? 1: 4 3 : 12 ? 2: 5 10 : 25 ? 5: 2 15 : 6? How did you calculate this?

When ratios are equal we know the relationship between the two sides of each ratio are the same. × 3 1: 3 × 3 = 2: 6 How can we find the multiplicative relationship? We can use this fact to change the equal relationships into an equation. = The reverse must be true too. =

When we have equal ratios we can manipulate them to create an equation. 1: 3 = 3: 9 = = Use these facts to form an equation and solve to find the unknown. 1: 4 = = 2: 5

Comparing Ratios DEMO = 1: 3

Comparing Ratios DEMO = 2: 5

Comparing Ratios DEMO =

Comparing Ratios DEMO =

Comparing Ratios DEMO = 1: 3 YOUR TURN = 2: 7

Comparing Ratios DEMO = 1: 3 YOUR TURN =

Comparing Ratios DEMO = 1: 3 YOUR TURN =

Comparing Ratios DEMO = 1: 3 YOUR TURN

Comparing Ratios DEMO = 1: 3 YOUR TURN

START

Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths. co. uk