Skip over navigation
Countdown
Age 7 to 14
Challenge Level 
How could you get close to the target?
How could you use rounding and estimation to help?
You might like to start by working on the level 1 and 2 problems initially, and then comparing your answer to the available solutions.
You may also like
What's My Weight?
There are four equal weights on one side of the scale and an apple on the other side. What can you say that is true about the apple and the weights from the picture?
Squaring the Circle
Bluey-green, white and transparent squares with a few odd bits of shapes around the perimeter. But, how many squares are there of each type in the complete circle? Study the picture and make an estimate.