A dual number line is useful for understanding percentages.

One side of the line is marked with the quantities and the other with the percentages.


12 out of 60 students play football. This means 20% of the students play football.

finding the part
finding the percent
finding the whole
Dual number line: 20% = ? of 60
Dual number line: 20% = ? of 60

Dual number line: 12 = X%?
Dual number line: 12 = X%?

Dual number line: 20% = 12 of ?
Dual number line: 20% = 12 of ?

What is 20% of 60 students?
What percent is 12 out of 60 students?
12 is 20% of what number?
Dual number lines can also be used to work out solution paths.

Dual number lines - missing part questions

Dual number lines - missing whole questions

Source:
http://www.education.vic.gov.au/studentlearning/teachingresources/maths/mathscontinuum/number/N55003P.htm