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1. Subtraction by mental calculation with regrouping
2. Subtraction using mental calculation of over ten -10 3. Subtraction by mental calculation of 10- some 4. Subtraction by calculation with regrouping(1) 5. Subtraction by calculation with regrouping(2) 6. Subtraction by calculation with regrouping(3) 7. Subtraction using calculation with regrouping(4) 8. Finding a number of a pair making ten 9. Subtraction using mental calculation with trgrouping(5) 10. Subtraction Nine Nine 11. Subtraction in various methods using mental calculation Achievement test Answers |