Question

Round the following numbers to 2 significant digits (a)3472 (b)84.16 (c)2.55 (d)28.5

Answer 1

a) 3500

   As the first two digits 3,4 are significant.

b) 84

   As the first two digits 8,4 are significant.

c) 2.6 or 2.5 (mostly 2.6 but depending on whether you add 1 when the previous digit is 5)

d) 28 or 29 (mostly 29 but depending on whether you add 1 when the previous digit is 5)

Answer 2

a) We have 3472,

•) Now For 3472 , we have to find the nearest 2 digit significant number.

•) Nearest 2 digit significant number for 3472 will be 3500.

b) We have 84.16,

•) Now for 84.16 , we have to find the nearest 2 digit significant number .

•) Nearest 2 digit significant number for 84.16 will be 84.

c) We have 2.55 ,

•) Now For 2.55, we have to find the nearest 2 digit significant number

•) Nearest 2 digit significant number for 2.55 will be 2.6.

d) We have 28.5 ,

•) Now For 28.5 , we have to find the nearest 2 digit significant number

•) Nearest 2 digit significant number fir 28.5 will be 28.