The general rule in formal writing (that which you do for school or work) is yes. All numbers that appear as two or fewer words should be written out.
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Yes, numbers should be written as full words.
In ordinary writing, the numbers one through ten are written as words. Higher numbers are written as numbers.A sentence should not start with a numeral, so write out the number (or reword the sentence).
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.
"0.01" should be written as "zero point zero one." But seriously, who even writes out numbers in words these days? Just stick with the digits and save yourself the trouble of trying to remember all those pesky rules.
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