Convert 5.100 × 10-3 to ordinary notation.
a.0.0005100
b.0.005100
c.510.0
d.5100

5.100 x 10⁻³ = 5.100 x 0.001
                    = 0.005100      (shift the decimal point for 5 by 3 units left)

Alternatively, because 10⁻³ = 1/1000, therefore
5.100 x 10⁻³ = 5.1/1000

           0.0051
         
1000 | 5.100
           5000
           
              1000
              1000
            
This yields the same result.

b. 0.005100

400- do the brackets first then the next one