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Have a go at the following questions.

Question 1 of 3

What is 100.6 x 21.7 to 4 significant figures?

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2183

You only need to know the answer to 5 digits:
100.6 x 21.7 = 2183.0
= 2183 to 4 significant figures

No, that is not the correct answer.

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Question 2 of 3

What is 0.07 x 0.3 to 2 significant figures?

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0.021

You need to know the answer to 3 digits of significance:
0.07 x 0.3 = 0.0210
= 0.021 to 2 significant figures
Both zeros are not significant.

No, that is not the correct answer.

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Question 3 of 3

What is 236.794 to 3 significant figures?

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237

The fourth digit of significance is 7, therefore the third digit is rounded up from 6 to 7.

No, that is not the correct answer.

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If you continue to have problems, have a look at the answer.