Best Answer

3 x 2 = 6 and 3 x 1 = 3

so

122 = 2 + 20 +100

so 3 x 2 = 6

and 3 x 20 = 60

and 3 x 100 = 300

Total: 6 + 60 + 300 = 366

Q: How can you use mental math to find 3 x 122?

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Well maby if you use math you would now. You find out when he was born and then subtract that from this year.

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No more than the average person. They don't need math for the job though.

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im 80% on this: yes. they use it for the ultraviolet rays

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3 x 1 = 3 3 x 2 = 6 3 x 122 = 366

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Mental math is basically just giving an estimate of what the value will be, for example: 5x306= 5x3 and add 2 zeros will give you 1500 and the actual answer is 1530 so its kind of like rounding off to the nearest.