It's the prime factorization.
2 x 3 x 5 x 7 = 210
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as a product of its prime factors: 2*3*5*7 = 210
Half of 420 is 210. To find half of a number, you divide it by 2. In this case, 420 divided by 2 equals 210. This is because division is the inverse operation of multiplication, and dividing by 2 is the same as multiplying by 0.5.
1 x 210, 2 x 105, 3 x 70, 5 x 42, 6 x 35, 7 x 30, 10 x 21, 14 x 15.
prime numbers.
It's the prime factorization: 2 x 2 x 2 x 3 x 5 = 120 Also note that you can always add x1x1x1... but these are not included in the prime factorization since 1 is not prime.