Question

Express 0.000123 in scientific notation.​
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Answer 1

$0.000123 = 1.23 \times {10}^{ - 4}$

Rule :

The exponent in scientific notation is equal to the number of times the decimal point must be moved to produce a number between 1 and 10.

Answer 2

Answer:

All numbers in scientific notation or standard form are written in the form m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer. Therefore, the decimal number 0.000123 written in scientific notation is 1.23 × 10-4 and it has 3 significant figures.