Question

With numbers we know that x < y if we have that x lies to the left of y on the number line

Find another way to see whether x < y that uses subtraction and natural numbers ?

Answer 1

The another way to find that x lies to the left of y is simply by calculating the difference of the numbers.

Let suppose $x<y$

$if, x-y<0 ,x \text{ is smaller than y} \Rightarrow \text{x lies to the left of y }$

$if, x-y>0, \text{ x is greater than y}\Rightarrow \text{x lies to the right of y.}$