They are all non-negative integers.
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10 + 0 =10 ?
In base 10, all numbers whose last digit is a 5 or a 0
0, 2, 4, 6, 8, 10...Follow this pattern with all the numbers.
2, 3, 5, 7
Tidy numbers are numbers that end with a 0 (10 and multiples of 10)