Addition and Subtraction Stories to 20 With Missing Addend

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There were 7 birds in a nest. 3 birds flew away. Now how many birds are in the nest?

4

There were 9 cars on the race track. 4 more cars joined the race. Now how many cars are there?

13

I picked 6 apples and 7 oranges from the fruit trees. How many fruits did I pick in all?

13

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