Question 851749
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
 97 - 10 = 87
red dot the starting point
{{{number_line( 600, -.5, 100, 97,87)}}}
 61 + 19 = 80
{{{number_line( 600, -.5, 100, 61,80 )}}}