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On a number line, point A is at 58. Point B is 1 step to the left of A and point C is 1 step to the right of A. What are B and C with respect to 58?

Class 6Whole NumbersWhole Numbers
  • AB is the successor and C is the predecessor
  • BBoth B and C are successors of 58
  • CBoth B and C are predecessors of 58
  • DB is the predecessor and C is the successor

Step-by-Step Solution

Moving 1 step left subtracts 1, so B = 57, the predecessor of 58. Moving 1 step right adds 1, so C = 59, the successor. Swapping the two names is the usual slip; remember that numbers grow towards the right.
Answer: D) B is the predecessor and C is the successor

Key idea: Successor and predecessor

Every whole number has a successor (the number one more than it). Every whole number except 0 has a predecessor (the number one less than it). Successor of 24 is 25. Predecessor of 100 is 99. Predecessor of 0 — there isn't one in the whole numbers. (The predecessor of 0 is −1, but that is an integer, not a whole number.)

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