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WOW, I guess this is already show level. You can perform such a supper skill on show.

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Thanks mate, but there are people who are still very ahead.

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It would take me 40 seconds just to read all the numbers haha You rock!

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Very impressive indeed! I might need 40 seconds just to add two of those numbersâ€¦

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@benjamin1990

If I know correctly, Benjamin you add digits from right to left right ?

And single digits per line, like 6 + 5 + 0 + 9â€¦

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I changed lastly into left-to-right, with this change I think I have win maybe 2-3 seconds more.

Yes, I do one row at time, adding 1 digit plus 1 digit at time.

What will be your time if you have to add just 2 rows.

9801318100
+4777530735

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Using 2 rows?

I never calculated this way but I think I will be 2 or even 3 times slower.

Jeonghe Lee, the best mental calculator of the world, use this technique.

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Amazing improvement congratulations.

About the method how do you add from left to right? I mean you need to know the result from the right to have the answer to the left columnđź¤”

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Gracias RamĂłn, ahora te cuento, en inglĂ©s, asĂ­ todos pueden ver la respuesta.

So, for example 45 + 67

We should know the end number first.

The end number of 8 + 7 is 5, because it ends in 15. The same way, the end number of 6 + 8 is 4, because it ends in 14.

Thatâ€™s for the units.

For the tens, whe should add the numbers and always add 1. In our example, 45 + 67, we must add 4 + 6 + 1, which gives us 11.

So, the answer of 45 + 67 is 11 for the tens and 2 for the end number of the units, so 112

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Thanks Benjamin,

So i understand you are adding one by one column from left to right, and writing the left answer when you have the right column info?

Example:

45
58
73
82
39

Left column = 27
Right column end number = 2

You write the 29 after calculating the right column?

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I start from below.

39 + 82 will be 121, because 3 + 8 + 1 = 12 and end number 1, because 9 + 2 = 11.

So 121.

121 + 73 will be 194 because 12 + 7 (theres no carry from right) and 1 + 3 = 4

So 194

194 + 58 will be 252 because 19 + 5 + 1 = 25 and end number 2, because 4 + 8 = 12

Etc the same way

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I know be heart end numbers, so i only look them and I already know the answer.

The difficulty is in the tens.

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Great work Benji!

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