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Yeah, how do you do it? I'm sure there are different ways to get to the same result.

Ryo1 8 Sep 8
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1

Level 8

I once was sick and returned the day of a test. I took one look at the test and asked the teacher if I could use my slide-rule. She looked at me like I was nuts and said, "Sure." Perhaps she knew, but all the formulas I needed were build into the slide rule, one just had to know how to access them. Got an A.

1

Level 8

7 + 8 = 15 + 60 = 75

1

Level 8

Something completely different to when 28 is multiplied by 47.

Yeah, that could be even more interesting!
1

Level 8

20+40+15=75

1

Level 8

7 +7+1+ 60

That's kinda unusual. I can see what you did there, though. 🙂
1

Level 9

60+15=75

2

Level 7

47 plus 30 =77 minus 2= 75

3

Level 9

I am a drummer. My job requires me to count no further than four, so I don't. It's a union thing. 😉

2

Level 8

20 plus 40 plus 15

I liked the 1960s new math but educators didn’t.

1

Level 9

. . . a very good read :

[goodreads.com]

Thanks!
1

Level 8

Well, someone told me this: 47 = 45, 28 = 30, therefore, 45 + 30 = 75
Do you think this method works with any numbers?
Have we got any mathematician here?

Ryo1 Level 8 Sep 8, 2021
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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!!
3

Level 9

Sixty plus fifteen.

1

Level 8

28 plus 40 plus 7

1

Level 8

7+8=15 carry 1. 4+2=6+1=7.
75

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.
2

Level 8

I don't know what new math is. I've heard the term, but don't know the process. For me, I added 2 to the 28 and subtracted it from the 47, then added 30 & 45.

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

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