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اسم المؤلف    Gareth Moore ,    Chris Dickason.

From the creators of the bestselling Brain Games for Clever Kids, this book contains mental maths conundrums to solve. Clever Kids can test their mental arithmetic by working out simple fractions, times tables, number pyramids and much more. All the answers can be found at the back of the book. From bestselling puzzle book author Dr Gareth Moore, the creator of the chart-topping Clever Kids series which has sold over 460,000 copies in the UK.