Margins

Weekly Problem 16 - 2008
A 30cm x 40cm page of a book includes a 2cm margin on each side... What percentage of the page is occupied by the margins?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative


A 30cm x 40cm page of a book includes a 2cm margin on each side, as shown. What percentage of the page is occupied by the margins?



Image
Margins

If you liked this question, here is an NRICH task which challenges you to use similar mathematical ideas.