
Addition and subtraction
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problemIn this investigation, you are challenged to make mobile phone numbers which are easy to remember. What happens if you make a sequence adding 2 each time?
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problem
Pros and cons
If p is a positive integer and q is a negative integer, which of these expressions is the greatest? -
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Caterpillars
These caterpillars have 16 parts. What different shapes do they make if each part lies in the small squares of a 4 by 4 square?
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problem
Pole star Sudoku 2
This Sudoku, based on differences. Using the one clue number can you find the solution?
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Alphabetti Sudoku
This Sudoku requires you to do some working backwards before working forwards.
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Two number lines
Max and Mandy put their number lines together to make a graph. How far had each of them moved along and up from 0 to get the counter to the place marked? -
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Number lines
Leah and Tom each have a number line. Can you work out where their counters will land?
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Secret number
Annie and Ben are playing a game with a calculator. What was Annie's secret number?
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Constellation Sudoku
Special clue numbers related to the difference between numbers in two adjacent cells and values of the stars in the "constellation" make this a doubly interesting problem.
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Making longer, making shorter
Ahmed is making rods using different numbers of cubes. Which rod is twice the length of his first rod?