Don't be put off by the name - it might not sound as serious as Long Division, but it's a very effective method.

If you already know Long Division, seeing Chunking might give you a feeling of smug superiority. Yet Chunking is a far more friendly method for learning about dividing, and not nearly as poor a relation to Long Division as some would have you believe.

There are quite a few methods for multiplying large numbers together. Watch this video to learn about Long Multiplication and how it compares to some of the others. Then download the software to get practising.

Here's a simple spreadsheet in which you can practise rules of divisibility. You can enter a number (or let Excel generate one for you), then use certain shortcuts (the "rules of divisibility") to see if the number can be divided exactly by 2, 3, 4, 5 and/or 9.