Changing Verbal Expressions to Algebraic Expressions

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There were 42 frogs in a pond. f of the frogs hopped away. how many frogs are in the pond now?

42 - f

David has b buttons. He gives away 84 buttons. How many buttons were left ?

b - 84

Peter had p coins. Then he found 83 more coins in a drawer. How many coins does Peter have now?

p + 83

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