Units and Measurements

Significant digit in simplification of ‌

0.501

0.05

(0.312−0.03)
In the subtraction of 0.312−0.03.
The number 0.03 has two digits after decimal.
So, 0.312−0.03=0.282
But only upto two decimal places it can be written as 0.28 .
Now, ‌

0.501

0.05

the term 0.05 has two digits after decimal
‌

0.501

0.05

=10.02≈10
Now, 10.02×0.28=2.8056
But this number should be rounded of to 2.8 .
So, number of significant digit is 2 .