Scale It Up!
A shape is enlarged by a scale factor of 2. This happens to all the side lengths.
What is “they double”?
The ratio of cats to dogs is 3 to 5. This is another correct way to write it.
What is 3:5 or 3/5?
This is the formula for the circumference of a circle.
What is C = 2πr or C = πd?
25% written as a decimal.
What is 0.25?
The new drawing is 3 times larger than the original. This is the scale factor.
What is 3?
A recipe uses sugar and flour in a ratio of 2:3. If you use 6 cups of sugar, cups of flour needed.
What is 9 cups?
A circle with radius 5 cm has this circumference (use 3.14).
What is 31.4 cm?
A shirt originally costs $20 and is 10% off. This is the discount amount.
What is $2?
A rectangle scaled by ½. This happens to the area.
What is “it becomes ¼ of the original area”?
Solve the proportion: 4/7 = x/21
What is 12?
The area of a circle with radius 6 cm.
What is 113.04 cm²?
You scored 42 out of 50 on a quiz. This is your percent score.
What is 84%?
A triangle’s side is 8 cm, and after scaling it becomes 20 cm. This is the scale factor.
What is 2.5?
Two ratios, 5:8 and 15:x, are proportional. This is the value of x.
What is 24?
A circle’s diameter is 12 cm. This is its radius and area.
What is r = 6 cm and area ≈ 113.04 cm²?
A price increases from $80 to $100. This is the percent increase.
What is 25%?
You scale a polygon by a factor of 4. This is how the perimeter and area change.
What is “perimeter ×4 and area ×16”?
A map scale says 1 inch = 40 miles. A trip measures 6.5 inches on the map. This is the real-world distance.
What is 260 miles?
Two circles have radii in a 1:3 ratio. This is how their areas compare
What is 1:9?
A number is decreased by 15% and becomes 51. This was the original number.
What is 60?