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Lesson 8.1 Mental Math Part 1 . Write the double of each number.4, 6, 1015, 45, 10035,42,27. Lesson 8.1. Write half of the number.2, 6, 1014, 18, 4050,90,600. Lesson 8.1. Lesson 8.1 Mental Math Part 2 . Lesson 8.1 Math Message. Take 3 sheets. Fold each one into 4 equal squares. Carefully
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