Estimation of Numbers

Estimate the sum 5, 290+17 , 986 by estimating the numbers to their nearest (i) hundreds (ii) thousands.

Which of the following statements regarding the estimates of number of species found on earth is not correct ?

Estimate the numbers to the nearest hundreds and find the product of 243 and 467.

Estimate the numbers for the central metal ion : (a) Oxidation state in [Mn(H_(2)O)_(6)]SO_(4)=x (b) d-orbitals occupation in cis-[Cr(en)_(2)Cl_(2)]Cl=y (if d^(8) then y=8) (c ) Co-ordination number in K_(3)[Co(C_(2)O_(4))_(3)]=z (d) Spin multiplicity in Cs[FeCl_(4)]=t Hence, find the value of z-(x xx y)+t

Estimating SUM

Estimate the number of atoms in a ring made out of 1cm^(3) of gold.

__________ is used in estimation of iodine number of fats and oils .