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problem
1 out of 3
Adding All Nine
11 to 14
1 out of 3
Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!
problem
1 out of 3
Chord
16 to 18
1 out of 3
Equal touching circles have centres on a line. From a point of this line on a circle, a tangent is drawn to the farthest circle. Find the lengths of chords where the line cuts the other circles.
problem
2 out of 3
New Units for Old
16 to 18
2 out of 3
Can you match up the entries from this table of units?
game
2 out of 3
Favourite
Transformation Game
11 to 14
2 out of 3
Why not challenge a friend to play this transformation game?
problem
2 out of 3
Favourite
Three Cubes
14 to 16
2 out of 3
Can you work out the dimensions of the three cubes?
problem
2 out of 3
Favourite
Estimating Time
11 to 14
2 out of 3
How well can you estimate 10 seconds? Investigate with our timing tool.
problem
1 out of 3
Favourite
Cannon Balls
16 to 18
1 out of 3
How high will a ball taking a million seconds to fall travel?
problem
1 out of 3
Favourite
Iffy Logic
14 to 18
1 out of 3
Can you rearrange the cards to make a series of correct mathematical statements?
problem
3 out of 3
Favourite
Scale Invariance
16 to 18
3 out of 3
By exploring the concept of scale invariance, find the probability that a random piece of real data begins with a 1.