1) There are 60 balls. Some of the balls is inside the basket. 17 balls are outside the basket.  a) 17 - [] = 60 b) 17 + [] = 60 2) There are several fish in the bowl. My father add 33 fishes into the bowl. There are 120 fishes altogether.  a) [] + 33 = 120  b) 33 - [] = 120 3) There are 100 cakes in the bakery. 36 cakes are eaten by Mimi. Several cakes are left. a) 36 - [] = 100 b) 100 - 36 = [] 4) There are 650 books on the rack. Then, my father take out several books from the rack. 342 books are left. a) 650 - [] = 342 b) 342 + [] = 650 5) There are 53 cars in the park. There is a red car. Several of cars are blue.  a) 1 + [] = 53 b) 53 - [] = 100 6) My mom buy 84 oranges. I give some of the oranges to my cousin. 44 oranges are left. a) 44 + 84 = [] b) 84 - [] = 44

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