1000 + 40 = 1040 1040 + 1000 = 2040 2040 + 30 = 2070 2070 + 1000 = 3070 3070 + 20 = 3090 3090 + 1000 = 4090 4090 + 10 = 4100 many people when they carry the one in their heads add to the thousand column.

this one gets me every time. I always start with the wrong answer then have to work it again. I need to practice the mental math from the brain quiz thingy.

It works that way because of the thought processes involved. Every other addition is a 1000 so the next total should be in a multiple of 1000 (ie. 5000)...

If you add the numbers in any other order, most people will get it right (although some won't because of the carry effect of the 1)

## 13 comments:

5,010

Nearly - check the answer.

+I can't highl;ight the answer for some reason, but I added 1,000 extra.

So, it's 4,110.

Getting closer, dearest. Come on, you "kicked Spud's ass", didn't you?

Good to see you back. :)

4,000 plus 40,20,20,30=4,110.

Why did you add 20 twice? The answer is hidden down in the right corner, under the picture.

That is one brain bender!!

1000 + 40 = 1040

1040 + 1000 = 2040

2040 + 30 = 2070

2070 + 1000 = 3070

3070 + 20 = 3090

3090 + 1000 = 4090

4090 + 10 = 4100

many people when they carry the one in their heads add to the thousand column.

this one gets me every time. I always start with the wrong answer then have to work it again. I need to practice the mental math from the brain quiz thingy.

good to see everyone playing together well... ;)

It works that way because of the thought processes involved. Every other addition is a 1000 so the next total should be in a multiple of 1000 (ie. 5000)...

If you add the numbers in any other order, most people will get it right (although some won't because of the carry effect of the 1)

It caught me out, even with the calculator in hand.

You add the four thousands first. Remember your answer. Then you add the fragments. Then you add your two sums. Bingo!

That's too intelligent, Dearieme - I've had to warn you about unwonted intelligence before. :)

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