median
don steward
mathematics teaching 10 ~ 16
Sunday, 16 June 2013
length comic strips
involving lengths as unknowns can be a helpful diagrammatic device for forming equations
in this case with the unknown on both sides
find the two original lengths, 'a' and 'b'
for question 1,
a + 2 = 2(b - 2)
so, a = 2b - 6
and
a - 1 = b + 1
so, a = b + 2
2b - 6 = b + 2
1.
2.
3.
4.
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