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Doubling and Halving. Double. This means to add the same number on again to make it twice as big. Halve. This means to split the number into two equal groups. . in. 6. out. 12. in. 10. out. 20. in. 8. out. 16. in. 5. out. 10. in. 7. out. 14. in. 6. 12. out. in. 8.
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