tag:blogger.com,1999:blog-2036014053389751696.post2063697703054624178..comments2024-08-07T08:29:41.242+01:00Comments on Colin Foster's Mathematics Education Blog: ProportionalityColin Fosterhttp://www.blogger.com/profile/12463017049484632672noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-2036014053389751696.post-34054070246099557522023-01-05T19:51:36.131+00:002023-01-05T19:51:36.131+00:00At a possibly earlier level:
Fractions: 2/5 = 20/5...At a possibly earlier level:<br />Fractions: 2/5 = 20/50 = 10/25 etc.<br />Percentages of: 10% of 360 is 36, 20% ... 72. 5% ... 18, etc.<br />Distance-Speed-Time calculations: 30 miles in 60 minutes, 3 miles in 6 minutes, 12 miles in 24 minutes etc.<br />Ratio: 2:3, 20:30, 10:15, etc. are all the same.<br />Pie Charts: 120 children = 360deg., 1 child = 3deg., 48 children = 144deg. etc.<br />Scale Drawing: 1 cm is1 km, 15 cm is 15 km, etc.<br /><br />Some of these maybe a bit out-of date!Wil Ransomenoreply@blogger.com