Operation with significant figures
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(1.212x3.18) + 4.8x10-4 - (0.0121x0.008142)
Your original formula, (1.212x3.18) + 4.8x10-4 – (0.0121x0.008142), is essentially an addition and subtraction operation. The last two terms are decimals less than 1, so they can be ignored; it is sufficient to calculate only (1.212x3.18). This expression has at most three significant digits, so the result should also be rounded to three digits, giving a value of 3.85. For reference only
What kind of calculation do you need, and how many significant digits should be retained?