about 90,000,000,000,000,000,000,000
a day times 30,000,000
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algebraic expression consists of numbers and operations
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.
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).
Yes, numbers should be written as full words.
The Real numbers.