No - 4.5/4 = 1.125
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Yes, 45 is a multiple of 15.
The Least Common Multiple of 45, 3, and 5 is 45.
Yes, 123456789 is a multiple of 3. To find out if it's a multiple of 3, you add the digits. In this case you would add 1+2+3+4+5+6+7+8+9=45. Now you take that 45 and divide by 3. If there is no remainder it is a multiple but if there is a remainder it is not a multiple. So in this case 45/3=15 with no remainder.
No - 45/6 = 7.5
The least common multiple of 45 , 81 = 405