Multiply ten by successive counting numbers.
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If you know the rules of divisibility, you know that 100 is divisible by 1, 2, 4, 5 and 10. Divide those numbers into 100. That's the rest.
100: 1, 2, 4, 5, 10, 20, 25, 50, 100
As it ends with 0 it's an even number, then 2 is a factor, then 10/2 is 5 and 5 is prime then 10 = 2 x 5, that's it!
Ten
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For 3 its 3,6,9,12,15,18,21,24,27,30 For 5 its 5,10,15,20,25,30,35,40,45,50
The first 10 multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, 32, 36, and 40.