In the third stage of the problem-solving process, learners are aiming for generalisation and possibly proof. (See the article Mastering Mathematics: The Challenge of Generalising and Proof.) Being able to generalise a situation involves identifying its underlying mathematical structure. Having transferred our thinking from one example to another, to
another, to another ..., the emerging similarities and differences offer us insight into what will always be true in that situation, which in turn can be explained by its underlying mathematical structure.
The tasks below provide opportunities for learners to get better at generalising.
The tasks below provide opportunities for learners to get better at generalising.
problem
Favourite
Nim-7
Age
5 to 11
Challenge level
Can you work out how to win this game of Nim? Does it matter if you go first or second?
problem
Favourite
Largest Even
Age
5 to 11
Challenge level
How would you create the largest possible two-digit even number from the digit I've given you and one of your choice?
problem
Favourite
Round the Two Dice
Age
5 to 7
Challenge level
This activity focuses on rounding to the nearest 10.
problem
Favourite
Ring a Ring of Numbers
Age
5 to 7
Challenge level
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
problem
Favourite
How Odd
Age
5 to 7
Challenge level
This problem challenges you to find out how many odd numbers there are between pairs of numbers. Can you find a pair of numbers that has four odds between them?
problem
Favourite
Lots of Lollies
Age
5 to 7
Challenge level
Frances and Rishi were given a bag of lollies. They shared them out evenly and had one left over. How many lollies could there have been in the bag?
problem
Favourite
Stop the Clock
Age
5 to 7
Challenge level
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
problem
Favourite
Magic Vs
Age
7 to 11
Challenge level
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
problem
Favourite
Three Dice
Age
7 to 11
Challenge level
Investigate the sum of the numbers on the top and bottom faces of a line of three dice. What do you notice?
problem
Favourite
Got It
Age
7 to 14
Challenge level
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.
problem
Favourite
Button-Up Some More
Age
7 to 11
Challenge level
How many ways can you find to do up all four buttons on my coat? How about if I had five buttons? Six ...?
problem
Favourite
Six Numbered Cubes
Age
7 to 11
Challenge level
This task combines spatial awareness with addition and multiplication.