Final answer:
The greatest non-zero-ending number not in tens/ones format is better expressed in scientific notation to handle large numbers efficiently, considering significant figures while removing unnecessary zeros.
Step-by-step explanation:
The student seems to be asking about numbering systems and how large numbers are represented differently than smaller, more commonly used numbers. Specifically, the student is curious about the largest number that does not end in "0" and is not expressed in the simple tens/ones format as in Spanish numbering conventions (e.g., cincuenta y seis for 56).
The answer involves the concept of scientific notation, a method used to express very large or very small numbers in a more compact form. In scientific notation, numbers are rewritten as a product of two factors - a decimal number and a power of ten. For example, 965 can be expressed as 9.65 × 102. It is important to note that in scientific notation, any leading or trailing zeros do not count as significant figures, but every digit in the decimal portion does.