Percentages (age 9+)

Question 1

You are mixing paint and you use 2 parts blue paint and 3 parts yellow paint. Which statement correctly explains why this comparison is a ratio, not a proportion?

Accepted Answer

It compares the amount of blue paint to the amount of yellow paint (part‑to‑part).

Answer

It compares the amount of blue paint to the total amount of paint (part‑to‑whole).

Answer

It says that the blue and yellow paints are equal in amount.

Answer

It tells you what percent of the mixture is blue paint.

Question 2

What is a 'scale factor' when we talk about making a shape bigger or smaller?

Accepted Answer

The number you multiply each dimension by to get the new size.

Answer

The total area of the new shape.

Answer

The difference between the lengths of the sides.

Answer

The percentage of the original shape that is left.

Question 3

A small model of a building is made that is exactly half the height of the real building. If you want to describe how the model must be enlarged to become the real building, what is the scale factor?

Accepted Answer

2

Answer

1/2

Answer

4

Answer

1/4

Try three questions

You are mixing paint and you use 2 parts blue paint and 3 parts yellow paint. Which statement correctly explains why this comparison is a ratio, not a proportion?

What is a 'scale factor' when we talk about making a shape bigger or smaller?

A small model of a building is made that is exactly half the height of the real building. If you want to describe how the model must be enlarged to become the real building, what is the scale factor?

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