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We could also solve this problem by asking “how much for 100 sq. of fertilizer should be used for a 700 sq. ft.įirst calculate how much fertilizer is needed for 1 square foot.ġ sq. How much fertilizer should be used to treat a lawn that is 700 square feet? Ratio of fertilizer to area is 20 lbs : 1,000 sq. For 8 servings multiply by 8.įeeling hungry? Try this Changing Recipe QuantitiesWorksheet.Ī lawn fertilizer should be spread in a ratio of 20 lbs to every 1,000 square feet. Ratio of people to beef is 5 people : 10oz.įirst calculate how much beef is needed for 1 serving.ġ serving needs 2 oz. The recipe is for 5 servings but you want to make enough for 8. You are using a recipe for meatloaf that calls for 10 oz. In the following examples we will ask ourselves, “how much for one?” Problems with ratio and proportion can often be solved using this strategy. We would need 4 pizzas to feed 12 people. How many pizzas do you need for the party? Ratio of pizza to people is 1:3 You are having a party and there will be 12 people there. You have found that a good ratio of pizzas to people is 1:3. Here are some more examples of the types of problems that can be solved using direct proportion. We would need 8 cans of blue and 6 cans of red paint. What would we need if we doubled the amount of paint in direct proportion? We would double the amount of blue paint. In our first example we had 7 cans of paint in a ratio of blue to red of 4:3. It does mean we would have 4 red for every 3 blue cans. This does not necessarily mean we every mixture would have 4 red and 3 blue cans. For example, in the purple paint mixture, the ratio of blue to red of 4:3.
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Make sure your child can identify the difference between ratios and total quantities. In our previous paint example we could use direct proportion to mix enough paint to decorate just one wall, or enough to paint one room, or enough to paint an entire apartment block if the ratio remains the same, the mixture of paint will remain the same color. The term direct proportion means that two (or more) quantities increase or decrease in the same ratio.