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MEAP Preparation - Grade 6 Mathematics3.18 Adding and Subtracting with Different Units

 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: Subtract: 21 ft 4 in - 15 ft 9 in =7 ft 5 in5 ft 7 in5 ft 5 in Q 2: 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 km1.5 km1.500 m500 m Q 3: Add: 1 ft 3 in + 2 ft 4 in =2 ft 6 in12 ft in3 ft 7 in Q 4: One fruit roll up is 2 ft long. You ate 1 ft 2 inches of it. How much is left?1 ft10 in2 in12 in Q 5: When you add or subtract lengths that are in different units you need to regroup them.FalseTrue Q 6: Add: 2 l 68 ml + 27 ml = (hint: 2.68 + 0.027=)2.007 liters2.707 liters2.007 liters Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!