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General revision Part 1 (Integer sequences- nth term (Formula = Sn = n ÷ 2…
General revision Part 1
Directed numbers
Rules:
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- Rule 1: If the signs are the same then add the numbers and keep the original sign.
- Rule 2: If the signs are different then subtract: Big number minus small number. Keep the sign of the big number.
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- Rule 1: The answer is positive when all the numbers are positive or when there is an even number of negative signs in the problem.
- Rule 2: The answer is negative when there is an odd number of negative signs in the problem.
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