Mental calculations
problem
Favourite
Butterfly flowers
Age
5 to 7
Challenge level
Can you find two butterflies to go on each flower so that the numbers on each pair of butterflies adds to the number on their flower?
problem
Favourite
Thousands and millions
Age
11 to 14
Challenge level
Here's a chance to work with large numbers...
game
Favourite
Dicey operations
Who said that adding, subtracting, multiplying and dividing couldn't be fun?
problem
Favourite
Days and dates
Age
11 to 14
Challenge level
Investigate how you can work out what day of the week your birthday will be on next year, and the year after...
problem
Favourite
Ladybirds in the garden
Age
5 to 7
Challenge level
In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?
problem
Favourite
Find the difference
Age
5 to 7
Challenge level
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
problem
Favourite
Where can we visit?
Age
11 to 14
Challenge level
Charlie and Abi put a counter on 42. They wondered if they could visit all the other numbers on their 1-100 board, moving the counter using just these two operations: x2 and -5. What do you think?
problem
Favourite
The brown family
Age
5 to 7
Challenge level
Use the information about Sally and her brother to find out how many children there are in the Brown family.
problem
Favourite
A square of numbers
Age
7 to 11
Challenge level
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?