Equivalent Ratios
What is the number one thing to remember about making Equivalent Ratios?
What you do to one side, you have to do to the other.
How many items do you need to create a scale?
TWO!
Set up the scale- 2 cm for every 500 ft as a ratio.
2cm:500ft
Turn 3/4 into a decimal.
.75
Reduce the ratio 49:84 to it's most basic form.
7:12
What is a Scale Drawing?
A drawing the compares two items that have the same shape but different sizes.
What is the SCALE FACTOR for the scale 2cm:500ft?
1 cm = 250 ft.
So- S.F. is 250 ft.
Turn 1 3/4 into a decimal.
1.75
Is the ratio 8:15 equivalent to the ratio 879:1430?
No.
What is a Scale Factor?
A number that indicates how much the shape has either grown or shrunk.
If the distance from the school to the library is 3.5 cm and the scale is 2cm:500 ft, how far in feet is the school to the library?
875 ft.
Find the area of a square that has one side that is 1 3/4 inches, and another side that is3 3/4 inches long.
6.5625 inches square
Explain the Addition method to finding and equivalent ratio.
You add each original number to itself.
What does Actual mean?
Something that is REAL.
If the Town Hall is 4.5 cm from the School and the scale is 2 cm:500 ft, how far in FEET is the Town Hall from the School?
1125 cm.
Find the area of a map of a swimming pool that is 5 cm long and 2.5 cm wide.
12.5 cm squared.
Explain the Multiplication Method when finding equivalent ratios.
You multiply the same number to each side.
What was the example item in the book for scale?
A pair of cowboy boots in San Antonio!
The actual distance between the library and the train station is 1250 ft. If the scale is 2cm:500ft, how many centimeters apart should the Library and the Train Station be?
5 cm.
The scale from the drawing to the actual pool is 6 meters to 1 centimeter. If the pool drawing is 5 cm to 2.5 cm, how big would the actual pool be?
450 meters squared