Adding large numbers can be tricky. Totaling up 376 and 582 in your head may be complicated. However, if you add numbers in multiples of ten, then it becomes much easier. Simply round each number up to the nearest ten and then add. For example, round up 376 to 380 and 587 to 590. Add 380 to 590 (here's a tip: just add 38=59) and you'll have 970. Then, you just subtract the numbers that you added on to round up. in this case, 4 and 3. Then, subtract the total of those numbers from the total - 970-7. 376+582=963. Mental math is all about making the process work for you, it doesn't have to make sense to anyone else!
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