John is 9 years old. Liz is 7 years old. John is how many years older than Liz?
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I have 6 dollars with me. I bought a toy car for 4 dollars. How many dollars I have left?
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8 birds are sitting on a tree. 8 of them flew away. How many birds will be left on the tree?
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Bruce has to clean 5 windows. He has cleaned 1 of them. How many are still left to be cleaned?
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I filled a tank with 7 gallons of water. 3 gallons leaked from the tank. How many gallons of water is left in the tank?
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