Question

5. State number of significant figure in each number, then add and express

result to an appropriate number of significant figure.

7.21, 12.141, 2.45 and 0.0028​

Answer 1

Answer:

1•) 3

2.)5

3.)3

4.)0

hope it helps you

Answer 2

Answer:

1) 7.21 = 3 significant figures .

2) 12.141 = 5 significant figures.

3) 2.45 = 3 significant figures .

4) 0.0028 = 2 significant figures !!

There are three rules on determining how many significant figures are in a number:

•Non-zero digits are always significant.

for ex = 2.14...etc .

•Any zeros between two significant digits are significant. ex= 1.102...etc

•A final zero or trailing zeros in the decimal portion ONLY are significant.

The problem comes with numbers like 0.00980 or 28.09.

in 0.00980 there are 3 significant figure ,since , 0 comes after a non zero number !!

• hope it helps

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