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How can we round off the following numbers to 3 significant figures

53456, 42.3456, 5.6784, 0.007945

Thanks

53456, 42.3456, 5.6784, 0.007945

Thanks

- Lucas
**Posts:**0**Joined:**Mon Jan 28, 2013 8:05 pm

MYP Maths, Rounding off to Significant figures

To round off to n significant figures you must look at the (n+1)th figure:

If it is less than 5, then you do not change the nth figure, and delete all figures after the nth figure, replacing by zeros if necessary.

If it is greater or equal than 5, you have to increase the nth figure by 1, and delete all figures after the nth figure, replacing by zeros if necessary.

Therefore,

53456 correct to 3 significant figures is 23500

42.3436 correct to 3 significant figures is 42.3

5.6784 correct to 3 significant figures is 5.68

0.007945 correct to 3 significant figures is 0.00795

Hope these help!!

To round off to n significant figures you must look at the (n+1)th figure:

If it is less than 5, then you do not change the nth figure, and delete all figures after the nth figure, replacing by zeros if necessary.

If it is greater or equal than 5, you have to increase the nth figure by 1, and delete all figures after the nth figure, replacing by zeros if necessary.

Therefore,

53456 correct to 3 significant figures is 23500

42.3436 correct to 3 significant figures is 42.3

5.6784 correct to 3 significant figures is 5.68

0.007945 correct to 3 significant figures is 0.00795

Hope these help!!

- miranda
**Posts:**268**Joined:**Mon Jan 28, 2013 8:03 pm

Thank you miranda!!

- Lucas
**Posts:**0**Joined:**Mon Jan 28, 2013 8:05 pm

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