Mathematical operations are carried out in the same way as normal decimal number operations.
Note, that the quantities involved in the calculations are all expressed in the same units.
Examples:
 19 cm + 23 m + 25.9 m
First convert everything to the same units:
19 cm = 0.19 meters
0.19 m + 23 m + 25.9 m = 49.09 m
Another way is to convert everything to centimeters and perform addition operation
23 m = 1300 cm
25.9 m = 1590 cm
19 cm + 2 300 cm + 2 590 cm = 4 909 cm
Final answer is expressed in meters as: 49.09 m
 A rope is 3 metres long. You cut 100 cms out of it. How many metres of the rope are remaining?
1 metre = 100 cms
Hence 3 m  1m = 2m
Answer: 2 m
Directions: Answer the following questions. Also write at least ten examples of your own.
