Quick Arithmetic: Thirty simple tricks of mental arithmetic by Yakov Perelman..This booklet is a collection of simple and easily grasped tricks to speed up your mental arithmetic. If you want to master them you should realize that to be used fully they need to be approached conscientiously, not mechanically. But it pays to master them as they will enable you to do calculations in your head without error, as with written calculations.
نحن نعمل على تصفية المحتوى من أجل
توفير الكتب بشكل أكثر قانونية ودقة لذلك هذا الكتاب غير متوفر حاليا حفاظا على حقوق
المؤلف ودار النشر.
