![missing multipliers](/sites/default/files/styles/medium/public/thumbnails/content-id-7382-icon.jpg?itok=6uMY2Jib)
problem
Missing Multipliers
What is the smallest number of answers you need to reveal in order to work out the missing headers?
![The Number Jumbler](/sites/default/files/styles/medium/public/thumbnails/content-id-14314-icon.jpg?itok=lmDl3Y1w)
problem
The Number Jumbler
The Number Jumbler can always work out your chosen symbol. Can you work out how?
![5 by 5 Mathdokus](/sites/default/files/styles/medium/public/thumbnails/content-id-15107-icon.png?itok=Shua5c9Y)
![Consecutive Numbers](/sites/default/files/styles/medium/public/thumbnails/content-97-11-bbprob2-icon.jpg?itok=C_UREbsv)
problem
Consecutive Numbers
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
![Dozens](/sites/default/files/styles/medium/public/thumbnails/content-98-03-six2-icon.png?itok=NzwxPabC)
![Two and Two](/sites/default/files/styles/medium/public/thumbnails/content-01-06-six2-icon.png?itok=r2AsNoHS)
problem
Two and Two
How many solutions can you find to this sum? Each of the different letters stands for a different number.
![Shady Symmetry](/sites/default/files/styles/medium/public/thumbnails/content-03-10-six5-icon.png?itok=UjCAUNKH)
problem
Shady Symmetry
How many different symmetrical shapes can you make by shading triangles or squares?
![Number Pyramids](/sites/default/files/styles/medium/public/thumbnails/content-id-2281-icon.png?itok=TJcIsRL4)
problem
Number Pyramids
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
![Consecutive Seven](/sites/default/files/styles/medium/public/thumbnails/content-id-2661-icon.png?itok=mnxknoG7)
problem
Consecutive Seven
Can you arrange these numbers into 7 subsets, each of three numbers, so that when the numbers in each are added together, they make seven consecutive numbers?
![Factors and Multiples Puzzle](/sites/default/files/styles/medium/public/thumbnails/content-id-5448-icon.png?itok=OmzhsOJB)
problem
Factors and Multiples Puzzle
Using your knowledge of the properties of numbers, can you fill all the squares on the board?
![m, m and m](/sites/default/files/styles/medium/public/thumbnails/content-id-6267-icon.png?itok=Q1S8r2JO)
problem
m, m and m
If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?
![Multiples Sudoku](/sites/default/files/styles/medium/public/thumbnails/content-id-6434-icon.jpg?itok=vjNndu-o)
problem
Multiples Sudoku
Each clue in this Sudoku is the product of the two numbers in adjacent cells.
![Sticky Numbers](/sites/default/files/styles/medium/public/thumbnails/content-id-6571-icon.jpg?itok=gK-R2-2J)
problem
Sticky Numbers
Can you arrange the numbers 1 to 17 in a row so that each adjacent pair adds up to a square number?
![Going round in circles](/sites/default/files/styles/medium/public/thumbnails/content-id-6651-icon.jpg?itok=q7CGjhH3)
problem
Going round in circles
Mathematicians are always looking for efficient methods for solving problems. How efficient can you be?
![Shifting Times Tables](/sites/default/files/styles/medium/public/thumbnails/content-id-6713-icon.png?itok=y_Wtw3Cv)
problem
Shifting Times Tables
Can you find a way to identify times tables after they have been shifted up or down?
![Magic Letters](/sites/default/files/styles/medium/public/thumbnails/content-id-7821-icon.png?itok=z67LWboP)
problem
Magic Letters
Charlie has made a Magic V. Can you use his example to make some more? And how about Magic Ls, Ns and Ws?
![Cryptarithms](/sites/default/files/styles/medium/public/thumbnails/content-id-11107-icon.jpg?itok=PZIqV5yE)
![Add to 200](/sites/default/files/styles/medium/public/thumbnails/content-id-11110-icon.png?itok=uXY6xAeD)
![Can you Make 100?](/sites/default/files/styles/medium/public/thumbnails/content-id-11819-icon.jpg?itok=TRBLygmu)
problem
Can you Make 100?
How many ways can you find to put in operation signs (+, −, ×, ÷) to make 100?
![Shape Products](/sites/default/files/styles/medium/public/thumbnails/content-id-13079-icon.jpg?itok=iQDaUs0G)
problem
Shape Products
These eleven shapes each stand for a different number. Can you use the multiplication sums to work out what they are?
![Almost One](/sites/default/files/styles/medium/public/thumbnails/content-id-13205-icon.jpg?itok=wClBY0YZ)
![Summing Consecutive Numbers](/sites/default/files/styles/medium/public/thumbnails/content-97-05-six4-icon.png?itok=qriTyABd)
problem
Summing Consecutive Numbers
15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?
![Number Daisy](/sites/default/files/styles/medium/public/thumbnails/content-01-07-six1-icon.jpg?itok=MsQGFTpw)
problem
Number Daisy
Can you find six numbers to go in the Daisy from which you can make all the numbers from 1 to a number bigger than 25?
![Squares in rectangles](/sites/default/files/styles/medium/public/thumbnails/content-id-4835-icon.png?itok=WIB6uV96)
problem
Squares in rectangles
A 2 by 3 rectangle contains 8 squares and a 3 by 4 rectangle
contains 20 squares. What size rectangle(s) contain(s) exactly 100
squares? Can you find them all?