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 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.
 Q 1: Add: 1 ft 3 in + 2 ft 4 in =2 ft 6 in12 ft in3 ft 7 in Q 2: One fruit roll up is 2 ft long. You ate 1 ft 2 inches of it. How much is left?12 in1 ft10 in2 in Q 3: When you add or subtract lengths that are in different units you need to regroup them.TrueFalse Q 4: Your school is 1 km east of your home and the library is 500 m east of the school? How far is the library from your home?1.5 km1.500 m500 m1 km Q 5: John weighs 33.5 kg with his shoes on. His shoes weigh 325 grams. How much does he weight without his shoes?Insufficient information33 kg and 325 grams33.175 kg32.675 kg Q 6: Subtract: 21 ft 4 in - 15 ft 9 in =7 ft 5 in5 ft 7 in5 ft 5 in Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!