When adding or subtracting approximate numbers, the result should
have the precision of the least precise number.
Example
2.3 + 6.528 + 13. 45 = 22.3
Notice that the answer in this example has the same
precision of the least precise value.
When multiplying or dividing approximate numbers, the result
should have the accuracy of the least accurate number.
Example
5.625 x 3.87 = 21.76875
But since we have only 3 significant digits the answer
becomes ≈ 21.8
When finding the square root of a number, the result should have
the same accuracy as the number.
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