### Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

### Have You Got It?

Can you explain the strategy for winning this game with any target?

### Counting Factors

Is there an efficient way to work out how many factors a large number has?

# Product of Fractions

##### Age 11 to 14 ShortChallenge Level

Can you find an efficient way of calculating the product below, without using a calculator?

$$1\frac23\times1.8\times1\frac17\times1.75\times1\frac56$$

This problem is taken from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.