Odd and even numbers
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problemNumber round up
Age5 to 7Challenge level
Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.
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articleAll is number
Read all about Pythagoras' mathematical discoveries in this article written for students.
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articleMultiplication series: number arrays
This article for teachers describes how number arrays can be a useful representation for many number concepts. -
articleImpossible sandwiches
In this 7-sandwich: 7 1 3 1 6 4 3 5 7 2 4 6 2 5 there are 7 numbers between the 7s, 6 between the 6s etc. The article shows which values of n can make n-sandwiches and which cannot. -
articleModulus arithmetic and a solution to differences
Peter Zimmerman, a Year 13 student at Mill Hill County High School in Barnet, London wrote this account of modulus arithmetic. -
gamePart the piles
Age7 to 11Challenge level
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy? -
gameDown to nothing
Age7 to 11Challenge level
A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.
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gameOdds and threes
Age7 to 11Challenge level
A game for 2 people using a pack of cards Turn over 2 cards and try to make an odd number or a multiple of 3.
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