6
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3 significant figures.
123 + 456 + 7890 = 8469
12,000,000 - 6 zeros :) 123 456
Rounding just the solution to the nearest thousand, 123 + 456 is approximately equal to 1000.
Add as many zeroes to the right as there are digits to the right of the decimal point. Eg 123 divided by 4.56 becomes 12300 divided by 456...