The product of 123 by 0.2321 is 28.5483 to 6 significant figures.

There are multiple strategies that can be utilised to manually calculate the product of two numbers.

1. Use a calculator
2. Break down the problem into smaller multiplications as I have previously demonstrated
3. Use pen and paper multiplication techniques (https://en.wikipedia.org/wiki/Multiplication_algorithm)

With regards to the significant figures. I wasn't quite sure what you meant by 'with the proper significant figures'. I have stated above a number, with its corresponding number of significant figures.

The number of significant figures of a given value corresponds to the number of digits that are used to express it to the required degree of accuracy, starting from the first non-zero digit.
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