use the tens place to multiply by 2, then use the number to subtract the ones place.The answer can be divided by 7, if not it will be 0.use 490 as an example.9x2=18.18-4=14.14 divided by 7 is 2. so 49 can be divide by 7
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The multiples of 20 are: 20,40,60,80,100,120,140,160,180,200,220.... The list goes on and on.
The multiples of 243 is 1, 3, 9, 27, 81, and 243.
Each time you add 7 chairs perhaps?
It is -2*(3x2 - 7)*(x3 - 7x)-3
yes, every multiple of 9 is a multiple of 3, but that doesn't cover all of them ...there are more multiples of 3 besides those.