What is the purpose of cross multiplication in solving proportions?

Solving Proportions with Variables

Interactive Video
•
Mathematics
•
6th - 10th Grade
•
Medium

Liam Anderson
Used 12+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To find the value of the unknown variable
To subtract the known values from each other
To multiply numbers across the proportion
To add values on both sides of the equation
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in solving proportions using cross multiplication?
Divide both sides by the variable
Add the values on both sides
Draw arrows to represent cross multiplication
Isolate the variable
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does cross multiplication help to eliminate in solving proportions?
The fractions in the equation
The need for addition
The variable from the equation
The need for subtraction
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the first example, what is the value of 'N' when 4/10 equals N/25?
5
20
10
15
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you isolate the variable in a proportion equation?
By multiplying both sides by the variable
By dividing both sides by the multiplier of the variable
By subtracting the multiplier
By adding both sides
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you find the value of the variable in a proportion?
By dividing the known value by the variable
By subtracting the known value from the variable
By adding the values on both sides
By cross multiplication and isolating the variable
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to isolate the variable when solving proportions?
To simplify the equation
To prepare the equation for addition
To find the value of the variable
To eliminate the denominator
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