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1. Counting on develops over time (level F)
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2. Partitioning and bridging to add (levels 1 and 2)
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3. Partitioning and bridging to subtract (levels 1, 2 and 3)
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4. Adding and subtracting 10, and (later) 9 (levels 2 and 3)
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5. Doubles and Near Doubles (levels 2, 3 and 4)
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6. Adding and subtracting 101,99 (levels 2, 3 and 4)
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7. Intuitive strategies for addition (levels 3,4 and 5)
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8. Intuitive and mental strategies for subtraction (levels 3, 4 and 5)
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9. Shortcuts for adding decimals (levels 4, 5 and 6)
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10. Shortcuts for subtracting decimals (levels 4, 5 and 6)