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What is the predecessor of −1, and what is its successor?

Class 7Integers (Extended)Integers
  • A0 and −2
  • B−2 and 0
  • C−2 and 1
  • D1 and −2

Step-by-Step Solution

The predecessor is one step to the left: −1 − 1 = −2. The successor is one step to the right: −1 + 1 = 0. Swapping the two is easy to do, because among negatives the predecessor is the one with the LARGER digits. Note also that the successor of −1 is 0, not 1, since 0 sits between −1 and 1.
Answer: B) −2 and 0

Key idea: Multiplying more than two integers

Count the number of negative factors:
- **Even** number of negatives → product is positive.
- **Odd** number of negatives → product is negative.

Examples: has three negatives (odd) → negative. Compute the magnitude: . Result: −24.

has two negatives (even) → positive. Magnitude: . Result: +24.

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