（7歲10個(gè)月，二年級(jí)上）這是Murderous Maths這套書的第三本。稍微翻了翻，覺得對(duì)于二年級(jí)的桃同學(xué)來說，這一本似乎比前兩本簡單一點(diǎn)。
What are the essential arithmetricks？
Main idea：Whatever you are good at，you have to start at the bottom and get to grips with the bare essentials.
In maths the bare essentials—adding，subtracting，multiplying and diving—are called “arithmetic”.
This book is going to introduce you to a completely different world full of exploration, discovery, fun, games, challenges, tricks and triumphs, and probably most important of all — money!
Whether you become a sports star, an artist, a pop singer or the prime minister—at some point you are going to wonder if you’ve been given the right wages, and when it comes to working it out the best person to trust is yourself, providing you know some murderous maths.
2017
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