Odd and even numbers
problem
Number Round Up
Age
5 to 7
Challenge 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.
article
All is Number
Read all about Pythagoras' mathematical discoveries in this article written for students.
article
Multiplication series: Number arrays
This article for teachers describes how number arrays can be a useful representation for many number concepts.
article
Impossible 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.
article
Modulus 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.
problem
Eightness of Eight
Age
5 to 7
Challenge level
What do you see as you watch this video? Can you create a similar video for the number 12?
problem
Next-door Numbers
Age
5 to 7
Challenge level
Florence, Ethan and Alma have each added together two 'next-door' numbers. What is the same about their answers?
problem
Always, Sometimes or Never? Number
Age
7 to 11
Challenge level
Are these statements always true, sometimes true or never true?
problem
Always, Sometimes or Never?
Age
5 to 11
Challenge level
Are these statements relating to odd and even numbers always true, sometimes true or never true?