Related Collections
You may also like
Homes
Six new homes are being built! They can be detached, semi-detached or terraced houses. How many different combinations of these can you find?
Number Squares
Start with four numbers at the corners of a square and put the total of two corners in the middle of that side. Keep going... Can you estimate what the size of the last four numbers will be?
Age 5 to 7
Challenge Level
This task focuses on the calculation
62 - 58
What do you notice about this calculation?
How would you work out the answer?
In the video below, you'll see someone calculating 62-58, but she makes a mistake.
Watch it all the way through. You may like to watch it more than once.
What is the mistake? How could she put it right?
Did you use the same method as the girl in the video? Why or why not?
Can you give an example of a subtraction calculation which you would solve using the method in the video, if you did not use it to solve 62-58?
NRICH is part of the family of activities in the Millennium Mathematics Project.