Just count them - there are not THAT many of them.
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Numbers 10 and less can be written numerically, e.g. 5 is written as 5. Numbers greater than 10 should be spelled out so 49 should be written as forty-nine.
Nine of them. All consecutive integers have nine tenths between them.
-9
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
There are nine one-digit numbers from 1 to 50. These numbers are 1, 2, 3, 4, 5, 6, 7, 8, and 9. All other numbers in that range are two digits or greater.