Twenty 20
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Move the decimal points to the left. The number of places to the left is the number of 0s in the denominator.
0 to the nearest hundred, for example.
Counting by 5s and counting by 10s are similar because both involve skipping numbers to reach the next multiple. When counting by 5s, you add 5 to the previous number each time. When counting by 10s, you add 10 to the previous number each time. Both methods are efficient ways to quickly determine the multiples of a given number.
526 = DXXVI
526 = 5.26x10²