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2. Missing dollar riddle - Wikipedia

   en.wikipedia.org/wiki/Missing_dollar_riddle

   From the perspective of the bellhop, his assets are $2, and his liabilities are $3 to guests and $25 to the register at the desk ($30 = 2 + 3 + 25). To illustrate the issue through equations: 1) 10 + 10 + 10 = 30

3. Power of 10 - Wikipedia

   en.wikipedia.org/wiki/Power_of_10

   Visualisation of powers of 10 from one to 1 billion. A power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ten are:

4. Radix - Wikipedia

   en.wikipedia.org/wiki/Radix

   In contrast to decimal, or radix 10, which has a ones' place, tens' place, hundreds' place, and so on, radix b would have a ones' place, then a b 1 s' place, a b 2 s' place, etc. For example, if b = 12, a string of digits such as 59A (where the letter "A" represents the value of ten) would represent the value 5 × 12 2 + 9 × 12 1 + 10 × 12 0 ...

5. Scientific notation - Wikipedia

   en.wikipedia.org/wiki/Scientific_notation

   To represent the number 1,230,400 in normalized scientific notation, the decimal separator would be moved 6 digits to the left and × 10 6 appended, resulting in 1.2304 × 10 6. The number −0.004 0321 would have its decimal separator shifted 3 digits to the right instead of the left and yield −4.0321 × 10 −3 as a result. Scientific to ...

6. Truncatable prime - Wikipedia

   en.wikipedia.org/wiki/Truncatable_prime

   A variation involves removing 2 or more decimal digits at a time. This is mathematically equivalent to using base 100 or a larger power of 10, with the restriction that base 10 n digits must be at least 10 n−1, in order to match a decimal n-digit number with no leading 0. See also. Permutable prime; References

7. Senary - Wikipedia

   en.wikipedia.org/wiki/Senary

   A senary ( / ˈsiːnəri, ˈsɛnəri /) numeral system (also known as base-6, heximal, or seximal) has six as its base. It has been adopted independently by a small number of cultures. Like the decimal base 10, the base is a semiprime, though it is unique as the product of the only two consecutive numbers that are both prime (2 and 3).