Why do you start with the greater number when adding on a number line?

You start with the greater number when adding on a number line simply for convenience.

Put it this way:

Would you rather add more to a small number or add less to a large number?

Naturally people would choose to add less to a large number because that way you do not have to do so much work. So, you would start with the greater number when adding on a number line.

7.3

step-by-step explanation:

81+30=111180 minus 111=691/2×19=9.569÷9.5=7.263157895~7.3