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That sounds like the method my mother (a grocery cash register operator) taught me.I’m in my 60’s and I’m a victim of ‘new math’. Right in elementary school when I should have been getting a foundation in math. Truly, it ruined any hope of me understanding math.
When I was in high school, I wash a cashier at a department store. Does anyone remember Zayre? Anyway, I had a definite knack for jacking change. Give me a $20 for a $16.72 purchase? seventy three, seventy four, seventy five, $17, 18,18,20.
So, three pennies, a quarter and three singles.
Pennies to get to a multiple of 5 10 25...
Start counting with the purchase total then count change to match the tendered bill.
I may have been subjected to "new math" but it treated me well and I exploited that in mist of my life.
But Common Core Math
I spent hours watching Youtube videos trying to understand the specialized vocabulary that must be understood to answer common core math questions.
Mind you I have studied various forms of mathematics (quantum mechanics, complex variables, linear algebra and matrix operations..) but common core uses term I and my kids never heard about.
But that is what my granddaughters have had to go through.
Ben