Question 393286
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Hi
Might recommend using a number line..back 20 from 60 for subtracting...
Going forward from 20(as in adding)to end up at that same '40' spot..
as the equal sign says...how far forward from 20 would that be??
{{{number_line( 600, -100, 100, 60, 40, 20 )}}}
Important concept! understanding the relationship between numbers
on the number line and how to move from one to another using
addition and subtraction. My best to You both.