Because when you do not add units to a number,your answer will be ordinary like for example,if your answer is 11cm,and,you did not put the units,which is cm.,then your answer will not be thought as a centimeter.Your answer will be thought as something else like if your answer is 11cm. and you did not put cm.,it will be thought like 11meters or 11cats.
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525 is one such number. You can add any number of thousands to it.
It means five lots of one hundred, add one lot of tens and then 3 units.
12
Add the last digit (units digit) to twice the previous digit (tens digit). If this sum is divisible by 4, so is the original number.
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