Yeah, that could be even more interesting!

That's kinda unusual. I can see what you did there, though.

Thanks!

Sort of......
28 needs 2 to become 30. Add 30 to 47 and you get 77, which is too much by 2, so the answer is 75.
It takes much longer to explain than to do it in your head!!

Too complex and needs too much memorisation.

I tend to do that way on a piece of paper.

@Ryo1 I would have to. But I prefer calculating in my head.

@Petter Yeah, in my head, I would probably calculate 30 plus 47 and take away 2.

This is why I did not do well on math. It was never taught to me thin the manner that you folks have taught me. Thanks everyone. I got it at last. Yay! Open the champagne.

What do you think about this?
47 =45, 28=30, 45+30= 75

@Ryo1 That seems backwards and confusing. What does 47=45 even mean? Also, why is the second number first?

@Ryo1 47=50 28=25 Just saying.

@barjoe Wow, that works, too!

@barjoe, @JeffMurray Madness, eh? Lol

@Ryo1 anything "works" provided whatever amount you nick from one number is added to another number, even the answer. So, for example, you could nick 7 from 47 and 8 from 28, leaving 40 and 20 to add up.(60). Then add the 8, (68) and the seven (in two stages if you prefer (+2 gives 70 and +5 more gives 75). It's all a matter of balance.

@Petter True. I use those methods in my head and I don't recall that I ever learned them when I was in school. A streetwise kind of practice, I guess. Lol

Hey, we agree. That the easy way to do it in your head.

@starwatcher-al learned it in first or second grade. I went to an experimental grade school. And they did call it "new" math. Obviously, that has evolved over the years, as I have heard nightmare explanations about the current "new" math from young parents. I learn the time-wasting "tradionzl" way @Moolah learned, years later but never abandoned using my "easy" way. I am a firm believer in whatever works for "you"

@MsKathleen If only they had permitted me to use my fingers.

@Mooolah I believe there was a time when using fingers was incorporated into “new” math.

@MsKathleen
I learned my basic arithmetic in the latter 1940s. There was no "new maths", just simple logic taught by good teachers, including my parents.
I learned my multiplication tables by rapidly adding the same number to itself, . Eg. 6,12,18,24,30,36 etc