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All EVEN Numbers are divisible by '2'
All numbers ending in '5' or ''0' are divisible by '5'
All numbers whose digits add to '9' are divisible by '9'. e.g. 234 2+3+4 = 9
All numbers whose form is ' m(m+n)n ' e.g. 132 are divisible by '11'.
This leaves only '3' and '7' to test by actual division.
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When you move the decimal point how can you know whether you are increasing or decreasing the number?
Simply look at the number!
LCM of 3 2 7?
The lowest common multiple (lowest number which goes in all three) of 3,2 and 7 is 42. We know that 3, 2 and 7 cannot be divided by one another to give an integer, so we must multiply them to get the LCM.
What is number between 40 and 50 and has a multiple of 86?
Of any integers, start with dividing by 1, 2, 3. You know /1=86. /2 is 43. That's your answer. Any number after this gives you a smaller number than 40
Which number is a factor of 21 but not a multiple of 7?
3 is a factor of 21 and it is not a multiple of 7.
One sixth of a number is twelve What is the number?
Designate the unknown number by n. If n/6 = 12, n = 12 X 6 = 72. Another answer: You must be an American. In any other country you would know your 12 times tables and know the answer in your head.
