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Reteach: Multiplicative Comparison Set Size Unknown


Reteach: Guided Practice

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Independent Practice: Multiplicative Comparison Set Size UnknownSolve each problem below by identifying the multiplier, and the number in the second set, which is a multiple of the first, unknown set. Divide the second set by the multiplier to find your answer. Go back to the problem to make sure you have answered the question being asked, and that your answer makes sense. 
It costs $500 to take a bus tour of Europe. This is four times as much as it costs to take a bus tour of Mexico City. How much is the bus tour of Mexico City? The multiplier is 4 . The number in the second set is 500 . 500 ÷ 4 = 125 The tour of Mexico City costs $ 125 . If you multiply the multiplier by your answer, you should get the cost of the European tour. Is your answer reasonable?

There are 256 students outside on the playground. This is eight times as many students as there are inside the cafeteria. How many students are inside the cafeteria? The multiplier is 8 . The number in the second set is 256 . 256 ÷ 8 = 32 There are 32 students inside the cafeteria. If you multiply the multiplier by your answer, you should get the number of students who are outside on the playground. Is your answer reasonable?

Franklin Middle School has 1,593 students. It has three times as many students as the nearest elementary school, Roosevelt Elementary. How many students attend Roosevelt Elementary School? The multiplier is 3 . The number in the second set is 1,593 . 1,593 ÷ 3 = 531 There are 531 students attending Roosevelt Elementary School. If you multiply the multiplier by your answer, you should get the number of students who are attending Franklin Middle school. Is your answer reasonable?

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Related Resources
The various resources listed below are aligned to the same standard, (4OA02) taken from the CCSM (Common Core Standards For Mathematics) as the Word problems Worksheet shown above.
Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.^{1}
Example/Guidance
Worksheet
Multiplication and Division
 Multiplication Word Problems: Product Unknown : Product Unknown
 Multiplication Word Problems: Multiplier Unknown : Multiplier Unknown
 Multiplication & Division Word Problems
Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:
Use the four operations with whole numbers to solve problems
 Multiplication as Comparison (From Example/Guidance)
 MultiStep Problems (From Example/Guidance)
 Multiplication as Comparison (From Worksheet)
 Converting Metric Units of Measurement – Preassessment (From Worksheet)
 Word Problems: Money – Preassessment (From Worksheet)
 MultiStep Word Problems (From Worksheet)
 MultiStep Word Problems : Challenging (From Worksheet)