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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 in3 ft 7 in12 ft in Q 2: When you add or subtract lengths that are in different units you need to regroup them.FalseTrue Q 3: At Subway, you bought 6'' sandwich and your dad bought 1 foot sandwich. How many inches sandwich did you both buy together?18 inches1.8 ft1.6 ft16 inches Q 4: Subtract: 21 ft 4 in - 15 ft 9 in =5 ft 7 in7 ft 5 in5 ft 5 in Q 5: John weighs 33.5 kg with his shoes on. His shoes weigh 325 grams. How much does he weight without his shoes?33 kg and 325 gramsInsufficient information32.675 kg33.175 kg Q 6: Add: 2 l 68 ml + 27 ml = (hint: 2.68 + 0.027=)2.007 liters2.007 liters2.707 liters Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!