Adding in your head

Me too. I think my SATs broke down something like "Top 2 % for English" and "bottom 30% for Math."

 

I learned to at least count change in a cash register. 45 cents is 54 back. 35 is 65 back. It's rote memorization, like multiplication. 100, minus the total change, and you have made a dollar.

At $7.01 you give them 2 dollars and 99 cents from a ten. Anything added to 7 decreases the dollar amount one, then count back from 100. If someone has an 18.43 bill, and wants a five back, it's 19 dollars. So, give me 24 and I'll give you $5.57 back.

That's math I do in my head. All day. I check my register, the register checks me.

 

48
Beach boys
27
111
91
48
(musical notes)
58
68
78
75

 

I'm confused

 

That’s how I add in my head.