The difference between Add up and Sum up
When used as verbs, add up means to take a sum, whereas sum up means to produce a total by adding.
check bellow for the other definitions of Add up and Sum up
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Add up as a verb (transitive):
To take a sum.
Examples:
"usex Add up the prices and find out how much it will cost."
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Add up as a verb (intransitive):
To accumulate; to amount to.
Examples:
"usex If you can save even a couple of dollars per day, it will add up to a lot over a year."
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Add up as a verb (idiomatic, intransitive):
To make sense; to be reasonable or consistent.
Examples:
"usex His story just doesn't add up. Why would he have been at the restaurant the day before the event?"
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Sum up as a verb (ambitransitive):
To produce a total by adding.
Examples:
"We summed up the donations and found that we had just enough to pay the bills."
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Sum up as a verb (ambitransitive):
To summarize.
Examples:
"So, to sum up your argument, what you are saying is that it is impossible."