Because most people use counting numbers in increasing order, starting with 1.
Negative numbers, fractions and other numbers are learned later on.
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The number that comes after 2 is 1.
It is: 0 1 2 3 ... etc
The number before zero is negative one (-1). In the number line, negative numbers come before zero, with each number getting smaller as you move to the left. Therefore, the number that comes immediately before zero is negative one.
144 The sequence goes by adding the number plus the number before it to get the next number: 1+1=2 1+2=3 2+3=5 3+5=8...
The integer or whole number is 8408 that comes before 8409