median
don steward
mathematics teaching 10 ~ 16

Friday, 19 July 2019

slopes of hills

gradients of steep hills (updated due to a Guinness record change)

the powerpoint is here

there are some links (hidden slides) to youtube clips

there's a concern about whether sinA or tanA is used for gradient measures but it seems (appropriately) to be tangent of the angle







Sunday, 14 July 2019

various formulas

with a calculator
the powerpoint is here









Saturday, 13 July 2019

integer intersection points

the problem is adapted from that posed by user 526427 on MathStack Exchange, March 2nd 2018

using straight line graphs, find two intersection points for various ratios DN : NC (in the form 1 : k where k is an integer)

what if these intersection points have integer x-values?

a powerpoint







the width doesn't change the x values of the intersection points
(a stretch)




worms, beetles and loops

various ways to practice solving linear equations with the unknown on both sides
the powerpoint is here







Thursday, 20 June 2019

expanding and simplifying





sum to a sixth

the intention is that students play around with numbers, thinking about common multiples
the algebra and function might be explored at some later stage