Equivalent Ratios Problem Solving
Finding the missing number in a proportion Solving Proportions with missing numbers
Write as fractions Ask yourself, What did I multiply or divide by to get fromthe known term in ratio A to the known term in ratio B? = What can you multiply or divide 4 by to get 16? Do the SAME thing to the top number to find your missingvalue. The missingvalue can be in any position. Find the missing numbers The ratio of boys to girls is 2 to 3
The ratio of boys to girls is 2to 3.These are 12 boys inthe class, how many girls arein the class? The ratio of boys to girls is 4 to 1
The ratio of boys to girls is 4to 1.There are 30 studentsin the class.How many girlsare in the class? Some problems will give you a total.If you add to the two terms in the ratio, it will give you a total as well. 1st:Add the two terms in the original ratio = 5 This would be like saying it is a class with just 5 students. 2nd:Set up your proportion. 1 girl/5 students = ? Girls/30 students 3rd: Multiply or divide to find the missing number. The ratio of boys to girls is 4 to 1
The ratio of boys to girls is 4to 1.There are 20 studentsin the class.How many boysare in the class? 1st:Add the two terms in the original ratio = 5 5 studentsin the class 2nd:Set up your proportion. 4 boys/5 students = ? boys/20 students 3rd: Multiply or divide to find the missing number. The ratio of apples to oranges is 5 to 2
The ratio of apples tooranges is 5 to 2.If there are16 oranges, how many piecesof fruit are in the basket? If there are 24 pints of milk in the cooler
If there are 24pints of milk inthe cooler.Howmany pints arestrawberry? Type of Milk Chocolate 1 Regular 4 Strawberry 3 If there are 20 pints of regular milk. How many pints are chocolate?
Type of Milk Chocolate 1 Regular 4 Strawberry 3 If there are 2 regular pints of milk. How many total pints are there?
Type of Milk Chocolate 1 Regular 4 Strawberry 3 The picture shows the ratio of pears to strawberries
The picture shows the ratio of pears to strawberries. If there are 30 pieces of fruit, how many pears? how many strawberries? The picture shows the ratio of the dancers on stage
The picture showsthe ratio of thedancers on stage. If there are 30dancers, how manyguys are dressed inyellow? The picture shows the ratio of the dancers on stage
The picture shows the ratio of the dancers on stage. If there are 20 dancers dressed in blue, how many guys are dressed in yellow? The picture shows the ratio of the dancers on stage
The picture shows the ratio of the dancers on stage. If there are 24 dancers dressed in yellow, how many total dancers are there? What is theratio of cats todogs? If there are 10cats, how manydogs are there? If the total number of cats anddogs is 30, how many cats arethere? What is the ratio ofscoops of ice creamto cherries? If there are 7 cones,how many scoopsof ice cream arethere? If there are 48scoops of ice cream how many cherrieswill you have? You get 20 erasers for $1. 90 How much would 5 erasers cost
You get 20 erasers for $1.90 How much would 5 erasers cost? How much would 15 erasers cost? If Allya can ride hisbike to a town thatis 21 miles away in45 minutes how farcan he ride in 60minutes? A car can go 50 miles on 2 gallons of gasoline
A car can go 50miles on 2 gallonsof gasoline.Howfar can it go on 15gallons? On the average, Jack makes a basket nine times out of twelve shots when he is practicing. How many baskets can he expect to make when he tries 20 shots? You get 30 pencilsfor $4.50 How much would3 pencils cost? How much would12 pencils cost? A train travels at aconstant speed of80 miles per hour.
How far will it goin 90 minutes? A train travels at a constant speed of 80 miles per hour.
How long will ittake for the train totravel 28 miles?