3. Bob’s house is 7


– 8km from the school. If walks 5


– 3kg is 9


__ 10kg?


– 9km to the shop on the way to school, how


much further does he have to walk to get to school? 4. How much heavier than 2


Adding Mixed Numbers Sophie collected 11


– 5kg of leaves and Eileen collected 11


– 3kg of leaves. What was the total


weight of the leaves collected? You have 2 choices as to how to add the mixed numbers: Add them as mixed numbers.


11


– 5 + 11


1 3 __


– 3


15 + 15 __


15 = 28 __


15


– 5 + 4


18


– 3


__ 15 + 20


__ 15 = 38


Add them as improper fractions. 6


__ 15 = 28


__ 15


Which way do you prefer? Why? Do you see any advantages of doing it one way rather than the other? Are there any possible difficulties with either method? What if the fractions had been 94


– 5 and 2


Check it out both ways and see for yourself.


1. Now try these whichever way you prefer. a) 21


– 4 + 11


f) 1 7 __


– 6


10 + 62


– 3


b) 12 g) 93


– 9 + 33


– 4


– 7 + 22


– 3


c) 22 h) 37


– 3? Would there have been any problems?


– 5 + 33


– 8 + 54


– 9


__ 10


d) 41 i) 83


– 2 + 35


– 4 + 52


– 5


Fractions 1 61


– 8


e) 35


– 9 + 25


– 6


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