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Addition of rational numbers in seventh grade mathematics
Addition of rational numbers in seventh grade mathematics

1. Add the same sign, take the same sign, and add the absolute values;

2. Add and subtract different absolute values with different symbols, take the addend symbol with larger absolute value, subtract the smaller absolute value from the larger absolute value, and add two numbers with opposite numbers to get 0;

When a number is added with 0, it still gets this number.