2 out of 3
Which is the bigger, 9^10 or 10^9 ? Which is the bigger, 99^100 or 100^99 ?
2 out of 3
Stick some cubes together to make a cuboid. Find two of the angles by as many different methods as you can devise.
2 out of 3
See how the motion of the simple pendulum is not-so-simple after all.
3 out of 3
Things are roughened up and friction is now added to the approximate simple pendulum
1 out of 3
What two-digit numbers can you make with these two dice? What can't you make?
1 out of 3
This challenge is about finding the difference between numbers which have the same tens digit.
1 out of 3
Here are some short problems for you to try. Talk to your friends about how you work them out.
2 out of 3
In this problem it is not the squares that jump, you do the jumping! The idea is to go round the track in as few jumps as possible.
1 out of 3
How do you know whether you will reach these numbers when you count in steps of six from zero?
1 out of 3
Each child in Class 3 took four numbers out of the bag. Who had made the highest even number?
