What do you know about ratios? When have you seen or used ratios?

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Presentation transcript:

What do you know about ratios? When have you seen or used ratios?

What is a ratio? How many different ways can you write a ratio?

A ratio COMPARES two quantities (numbers). A ratio shows how much of one thing you have compared to something else.

a to b a:b a b All three are read as “the ratio of a to be”

Click for Interactive Video

What is an equivalent ratio? Create an example.

How many different ways can you find equivalent ratios for: 2 boys to 3 girls

How many different strategies can we share?

equivalent fractions multiplication tables tape diagram

The ratio of the length of Shanni’s ribbon to the length of Mel’s ribbon is 5 : 3. How much ribbon does Mel use if Shanni uses 45m?

The ratio of the number of laps Mason ran to the number of laps Laney ran was 2 to 3. If Mason ran 8 laps, how many did Laney run?

The ratio of the number of laps Mason ran to the number of laps Laney ran was 2 to 3. Use a table to list 4 more equivalent ratios.

The ratio of the number of laps Mason ran to the number of laps Laney ran was 2 to 3. Use a tape diagram to find how far Mason ran if Laney ran 930m.

In a bag of mixed nuts, the ratio of walnuts to cashews is 5 : 6. Use a tape diagram to determine how many walnuts are in the bag if there are 54 cashews.

On a test, the ratio of the number of problems Josie got incorrect to the number of problems she got correct is 2:9. If Josie missed 8 problems, how many did she get right?