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内容简介:我们的学习和生活离不开数字计算,离不开数字记忆。如果能够经常地进行一些有趣的难度适中的数字计算,同时有意识地记住一些具有特殊意义的数字,这将帮助我们记住与数字相关的诸多问题。一位数的乘法,共有45个算式,我们通过《乘法九九表》已经能够熟练地背诵。两位数的乘法,共有4000多个算式,这么庞大的数量,我们不敢想象能够记住每一个算式的积。通过本书的练
Introduction: Our study and life are inseparable from the digital calculation, can not do without digital memory. If we can often do some interesting numerical computations that are moderately difficult, while consciously remembering numbers that have special meanings, this will help us to remember the many problems associated with numbers. One-digit multiplication, a total of 45 formulas, we have been able to memorize by “multiplication nine nine tables.” Double-digit multiplication, a total of more than 4,000 algorithms, such a large number, we can not imagine can remember every product of the product. Through this book practice