Mental Math Tricks by Kevin OConnor - HTML preview
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Converting Kilometres to Miles
This is a useful method for when travelling between imperial and metric countries and need to know what kilometres to miles are.The formula to convert kilometres to miles is number of (kilometres / 8 ) X 5
So lets try 80 kilometres into miles
80/8 = 10
multiplied by 5 is 50 miles!
Another example
40 kilometres
40 / 8 = 5
5 X 5= 25 miles http://www.memorymentor.com/