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2.1: Addition of 1 digit numbers

2.2: Addition of 2 - digit numbers (with carrying)

2.3: Addition of 3 - digit numbers (without carrying)

2.4: Addition of 3 - digit numbers (with carrying)

2.4: Subtraction of 1-digit number from 2-digit number (with borrowing)

2.5: Subtraction of 3 - digit numbers (without borrowing)

2.6: Subtraction of 3-digit numbers (with borrowing)

2.7: Addition and Subtraction in Mixed form

2.8: Multiplication