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can someone give me 2 easy ways to calculate

error in addition

for example

5 +- 0.2 + 6 +- 0.1

and in mulitplication, like my newest lab

i have f = m tiems g

and the mass is +- 0.2 and gravity is +- 0.1 for example

mas is 25 g lets say, and gravity 9.8

so ya easiest way to calculate error in multi, and additio please :)

thanks