MathsClass

A blog about teaching and learning in a maths classroom.

WCYDWT: Spacing Evenly

Sunday, 12 September 2010 | 2 Comments

A real-life version of this problem presented itself today.

Question 20. Find the least number of cuts needed to cut a log into 5 equal pieces.

(Source: Elementary Math Mastery, Rhonda Farkota)

I installed this wall today so we could place a gate across the kitchen to keep our child safe.

Wall

I want three evenly spaced screws along the bottom of this wall.
Where should I drill the holes?

Wall

Of course, I measured, divided into three and started marking out the spots to drill.  As I marked the second spot I realised my mistake… and questioned my career choice.

Here are a series of images to use this as a problem in class.

Wall

Wall with tape measure

Wall with tape measure

Wall with tape measure

Did I get it right…?

Wall with tape measure

Wall with tape measure

Wall with tape measure

Wall finished

All these image files and a PowerPoint containing these images in the zip file below.

This work is licensed under a Creative Commons License (?).

Posted in • Lesson IdeaFractionsMeasurementNumberProblem SolvingMediaPhotoWhat can you do with this? | Short URL: http://mths.co/1978

Comments

Liz Hemmings on  12 September 10  at  06:50 PM #
Love your comment about your questioning your career choice. Even the "experts" make mistakes translating our theory to practise. I guess it makes a good case for more hands on learning.
Erin on  04 November 10  at  01:58 PM #
Smooth job with the carpentry work!

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