Because otherwise you are using figures which imply an accuracy that cannot be justified.
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61.37795276 in four significant figures is 61.38
86.346 +54.43 9.5 _______ 150.276 Now after we round the number and write it in significant figures , so it should look like this; 150 why? because when we need to round a number using the significant figures , we must look for the smallest significant figures which is 9.5 .
2.93e−3
113 - 45.05 = 67.95
4.82 * 10^1 (this is using three significant figures)