Bill has 7 crayons. 5 of them are in the green box and the others are in the red box. How many crayons are in the red box?
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Gail invited 8 friends to her birthday party. Only 2 friends came to the party. How many friends didn't came to Gail's party.
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George has to clean 6 windows. He has cleaned 2 of them. How many are still left to be cleaned?
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I filled a tank with 9 gallons of water. 5 gallons leaked from the tank. How many gallons of water is left in the tank?
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5 birds are sitting on a tree. 5 of them flew away. How many birds will be left on the tree?
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