How many intersections do you expect from four straight lines ?
Which three lines enclose a triangle with negative co-ordinates for
every point ?
Substitute -1, -2 or -3, into an algebraic expression and you'll
get three results. Is it possible to tell in advance which of those
three will be the largest ?
What does this number mean ? Which order of 1, 2, 3 and 4 makes the
highest value ? Which makes the lowest ?
Take a few whole numbers away from a triangle number. If you know
the mean of the remaining numbers can you find the triangle number
and which numbers were removed?
In this short problem, try to find the location of the roots of
some unusual functions by finding where they change sign.
Match the descriptions of physical processes to these differential
Solve these differential equations to see how a minus sign can
change the answer
Two students found all of the odd ones out, and gave clear
explanations of their reasoning. How many did you get right?
Go to last month's problems to see more solutions.
This article -useful for teachers and learners - gives a short
account of the history of negative numbers.
This Sudoku problem consists of a pair of linked standard Suduko puzzles each with some starting digits