I use numbers under ten in written form and over ten in number form. Dates should always be written in number form without the comma. Money is also used in number form. ie. $60 instead of sixty dollars, 1984 instead of nineteen eighty-four as in a year. 1,984 when talking about a quantity of something.
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This is a good site: http://www.grammarbook.com/numbers/numbers.aspNumbers 1-9 are written out, numbers 10 or above are handwritten, and most importantly be consistent, if using one or the other:ex: I bought 100 cats and two hundred dogs. IncorrectI bought one hundred cats and two hundred dogs. Correct
a list of numbers, categorized by the order of which the numbers appear. like: 1,2,3,4 vs 1,3,2,4.
Meant to say "half inch Proof Coil vs half inch size BBB" anchor chain.
Yes, the third decimal place is smaller The numbers can be converted to scientific notation: 5x10-3 vs 8X10-3 The exponents are the same, so you check the "characteristic" (5 vs 8).
Math can be learned hands on like counting blocks or beads, adding or subtracting them to get an answer. This is practical math vs written math (1+1=2).