The term DECIMAL refers to a number system that uses the BASE 10, which is composed of the digits 0-9. The crossword solutions BASEN (5 letters), DEWEY (5 letters), ONES (4 letters), TENTH (5 letters), TEN (3 letters) and TENS (4 letters) all refer to different aspects of the decimal system. BASEN is an alternate spelling of the word 'BASE' which is the number of digits used in the decimal system. DEWEY is a reference to the Dewey Decimal System, which is a library classification system that uses the decimal system. ONES, TENTH, TEN and TENS all refer to the place values of the decimal system, with ONES being the ONES place, TENTH being the tenths place, TEN being the tens place and TENS being the hundreds place.