This is the kind of habit that should be included in a class about thinking
with numbers. Millions and billions as well millionths and billionths are
often not readily grasped.
I sometimes talk to people interested in social issues and public policy
about difficulties in dealing with large and small numbers. I suggest that
when people see numbers like this in the news they write out the arithmetic
*even without doing the calculation.* To aid perception, it is important to
vertically align the decimal point. It also helps to cross out trailing zero
as long as it is done in both numerator and denominator.
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