Other tags that relate to Time to Evolve
Maths Supporting SET. Biology. Estimating and approximating. STEM - physical world. Chemistry. Working systematically. Physics. STEM - living world. Length/distance. Selecting and using information.There are 133 results
Broad Topics > Thinking Mathematically > Working systematically
Pole Star Sudoku
Age 14 to 18
Challenge Level
A Sudoku based on clues that give the differences between adjacent cells.
Problem Solving, Using and Applying and Functional Mathematics
Age 5 to 18
Challenge Level
Problem solving is at the heart of the NRICH site. All the problems give learners opportunities to learn, develop or use mathematical concepts and skills. Read here for more information.
Troublesome Triangles
Age 7 to 14
Challenge Level
Many natural systems appear to be in equilibrium until suddenly a critical point is reached, setting up a mudslide or an avalanche or an earthquake. In this project, students will use a simple. . . .
Counting on Letters
Age 11 to 14
Challenge Level
The letters of the word ABACUS have been arranged in the shape of a triangle. How many different ways can you find to read the word ABACUS from this triangular pattern?
Quadruple Clue Sudoku
Age 11 to 16
Challenge Level
Four numbers on an intersection that need to be placed in the surrounding cells. That is all you need to know to solve this sudoku.
Colour Islands Sudoku
Age 11 to 14
Challenge Level
An extra constraint means this Sudoku requires you to think in diagonals as well as horizontal and vertical lines and boxes of nine.
Oranges and Lemons, Say the Bells of St Clement's
Age 11 to 14
Challenge Level
Bellringers have a special way to write down the patterns they ring. Learn about these patterns and draw some of your own.
Extra Challenges from Madras
Age 11 to 14
Challenge Level
A few extra challenges set by some young NRICH members.
Tea Cups
Age 7 to 14
Challenge Level
Place the 16 different combinations of cup/saucer in this 4 by 4 arrangement so that no row or column contains more than one cup or saucer of the same colour.
Another Quadruple Clue Sudoku
Age 11 to 16
Challenge Level
This is a variation of sudoku which contains a set of special clue-numbers. Each set of 4 small digits stands for the numbers in the four cells of the grid adjacent to this set.
Making Maths: Double-sided Magic Square
Age 7 to 14
Challenge Level
Make your own double-sided magic square. But can you complete both sides once you've made the pieces?
Colour Islands Sudoku 2
Age 11 to 18
Challenge Level
In this Sudoku, there are three coloured "islands" in the 9x9 grid. Within each "island" EVERY group of nine cells that form a 3x3 square must contain the numbers 1 through 9.
Twin Corresponding Sudoku III
Age 11 to 16
Challenge Level
Two sudokus in one. Challenge yourself to make the necessary connections.
Seasonal Twin Sudokus
Age 11 to 16
Challenge Level
This pair of linked Sudokus matches letters with numbers and hides a seasonal greeting. Can you find it?
M, M and M
Age 11 to 14
Challenge Level
If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?
Pole Star Sudoku 2
Age 11 to 16
Challenge Level
This Sudoku, based on differences. Using the one clue number can you find the solution?
More on Mazes
Age 7 to 14
There is a long tradition of creating mazes throughout history and across the world. This article gives details of mazes you can visit and those that you can tackle on paper.
Twin Corresponding Sudokus II
Age 11 to 16
Challenge Level
Two sudokus in one. Challenge yourself to make the necessary connections.
Integrated Product Sudoku
Age 11 to 16
Challenge Level
This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.
Integrated Sums Sudoku
Age 11 to 16
Challenge Level
The puzzle can be solved with the help of small clue-numbers which are either placed on the border lines between selected pairs of neighbouring squares of the grid or placed after slash marks on. . . .
Advent Sudoku
Age 11 to 14
Challenge Level
Rather than using the numbers 1-9, this sudoku uses the nine different letters used to make the words "Advent Calendar".
Addition Equation Sudoku
Age 11 to 14
Challenge Level
You need to find the values of the stars before you can apply normal Sudoku rules.
Twin Line-swapping Sudoku
Age 14 to 16
Challenge Level
A pair of Sudoku puzzles that together lead to a complete solution.
Smith and Jones
Age 14 to 16
Challenge Level
Mr Smith and Mr Jones are two maths teachers. By asking questions, the answers to which may be right or wrong, Mr Jones is able to find the number of the house Mr Smith lives in... Or not!
Quadruple Sudoku
Age 11 to 16
Challenge Level
Four small numbers give the clue to the contents of the four surrounding cells.
Difference Sudoku
Age 14 to 16
Challenge Level
Use the differences to find the solution to this Sudoku.
Magnetic Personality
Age 7 to 16
Challenge Level
60 pieces and a challenge. What can you make and how many of the pieces can you use creating skeleton polyhedra?
Rainstorm Sudoku
Age 14 to 16
Challenge Level
Use the clues about the shaded areas to help solve this sudoku
Rectangle Outline Sudoku
Age 11 to 16
Challenge Level
Each of the main diagonals of this sudoku must contain the numbers 1 to 9 and each rectangle width the numbers 1 to 4.
Twinkle Twinkle
Age 7 to 14
Challenge Level
A game for 2 people. Take turns placing a counter on the star. You win when you have completed a line of 3 in your colour.
9 Weights
Age 11 to 14
Challenge Level
You have been given nine weights, one of which is slightly heavier than the rest. Can you work out which weight is heavier in just two weighings of the balance?
The Great Weights Puzzle
Age 14 to 16
Challenge Level
You have twelve weights, one of which is different from the rest. Using just 3 weighings, can you identify which weight is the odd one out, and whether it is heavier or lighter than the rest?
Latin Lilies
Age 7 to 16
Challenge Level
Have a go at this game which has been inspired by the Big Internet Math-Off 2019. Can you gain more columns of lily pads than your opponent?
Crossing the Bridge
Age 11 to 14
Challenge Level
Four friends must cross a bridge. How can they all cross it in just 17 minutes?
Warmsnug Double Glazing
Age 14 to 16
Challenge Level
How have "Warmsnug" arrived at the prices shown on their windows? Which window has been given an incorrect price?
Coins
Age 11 to 14
Challenge Level
A man has 5 coins in his pocket. Given the clues, can you work out what the coins are?
The Naked Pair in Sudoku
Age 7 to 16
A particular technique for solving Sudoku puzzles, known as "naked pair", is explained in this easy-to-read article.
Olympic Logic
Age 11 to 16
Challenge Level
Can you use your powers of logic and deduction to work out the missing information in these sporty situations?
Building with Longer Rods
Age 7 to 14
Challenge Level
A challenging activity focusing on finding all possible ways of stacking rods.
Simultaneous Equations Sudoku
Age 11 to 16
Challenge Level
Solve the equations to identify the clue numbers in this Sudoku problem.
Cinema Problem
Age 11 to 14
Challenge Level
A cinema has 100 seats. Show how it is possible to sell exactly 100 tickets and take exactly £100 if the prices are £10 for adults, 50p for pensioners and 10p for children.
Inky Cube
Age 7 to 14
Challenge Level
This cube has ink on each face which leaves marks on paper as it is rolled. Can you work out what is on each face and the route it has taken?
Medal Muddle
Age 11 to 14
Challenge Level
Countries from across the world competed in a sports tournament. Can you devise an efficient strategy to work out the order in which they finished?
NRICH is part of the family of activities in the Millennium Mathematics Project.