The 9 times table. Knowing your times tables is really helpful with mental maths and problem solving. You can easily tell whether a number is a multiple of 9 by adding the digits together.

Times tables are easy to learn, you know, when you’re multiplying by 2 and 3 in primary school. You’re either doubling or tripling the number, and if you’ve got your tables memorised, you can probably ...

Learn the times tables from 1-12 with fun, interactive BBC Bitesize maths videos, quizzes, ... The 7 times table. Fun KS2 maths 7 times table chart with division quiz and summary.

There might be patterns in some of them (the simple doubling of the 2 times table) but others you just learnt by rote. And it was never quite clear just why it was necessary to know what 7 x 9 is ...