| Multiplication 
        and division with constants and integers. | |
| When multiplying or dividing numbers by integers the integer is said to have as many significnat figures as needed. | |
| In 
        the calculation shown on the right 112.64 has five significant figures 
        while 3 has as many significant figures as needed. Therefore the answer 
        must be expressed to five significant figures. |  | 
| In the calculation shown on the right 112.64 has five significant figures while 5 has as many significant figures as needed. Therefore the answer must be expressed to five significant figures. |  | 
| In the calculation shown on the right 12.64 has four significant figures while the fraction 2/5 has as many significant figures as needed. Therefore the answer must be expressed to four significant figures. |  | 
| Continue with logarithms when calculating pH | |