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In “unknown start” problems, the starting number is the unknown number. Unknown Start: Change Plus Greta’s chicken laid some eggs. Then the chicken laid 7 more. Now Greta has 13 eggs. How many eggs did the chicken lay at the start? Unknown Start: Change Minus Patricia was carrying some books. Her friend took 3 of them. Patricia has 8 books left. How many books was she

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16y ago

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