We have learned that even numbers can be divided into pairs with no remainders. Therefore, if we add 2 to any even number it will remain even. But if we add 1 to any even number it becomes an odd number. From this we can deduce that any even number has the digits 0,2,4,6 or 8 as it’s units digits. As for the odd number, it’s units digit is either 1,3,5,7 or 9
:ملخص للدرس من اعداد محمد إبراهيم محمود
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