In which pair is the SECOND number the successor of the first?

Class 6Whole NumbersWhole Numbers

A4,509 and 4,510
B6,300 and 6,299
C999 and 1,100
D88 and 90

Step-by-Step Solution

A successor is exactly 1 more. Only 4,510 - 4,509 = 1. In the second pair the second number is 1 LESS, so it is the predecessor. The remaining pairs differ by 101 and by 2.

Answer: A) 4,509 and 4,510

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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