# Can you do this with out a calculator?

1. ### Akari_32Fishlore LegendMember

A friend of mine posted this on FaceBook. Try it! =D I'll post the rest of it (I cropped out the answer) after a few people post what answers they get

If you know it, don't spoil it!

2. B

5000

3. OP

### Akari_32Fishlore LegendMember

Now do it with a calculator, and see what happens ;D (But don't post it!)

4. B

I just did.....ooooops !!!

5. OP

### Akari_32Fishlore LegendMember

I know, right?? I just tried it a couple different ways, like adding up all the 1000's, then adding the smaller numbers, but it still does it

2100

7. OP

### Akari_32Fishlore LegendMember

What kinda math are you doing?

8. ### I keep fishWell Known MemberMember

idk The stupid kind I was just guessing

4100?

9. OP

### Akari_32Fishlore LegendMember

Lol when you do it in your head its supposed to come out to 5000 XD

10. ### I keep fishWell Known MemberMember

I did do it in my head

11. OP

:whistling:

12. ### angelfish220Well Known MemberMember

why is it hard? I got the same as post 8

14. OP

### Akari_32Fishlore LegendMember

It comes out to two different things depending on how you do it. Its creepy! I'll post the rest of the pic now lol

15. OP

### Akari_32Fishlore LegendMember

Here we go lol

16. ### kinezumi89Fishlore VIPMember

...as a soon to be engineer, I feel like a failure XD

17. OP

### Akari_32Fishlore LegendMember

Isn't it weird??

18. ### TmacDValued MemberMember

I nailed it the first time. I added all the thousands then the tens. My mind works that way though, I had to add time all the time when I worked in t.v.:;dete

19. ### ryanrModeratorModeratorMember

Take 1000 and add 40. = 1,040
and then add 1000. = 3,070
and then add 10. = 4,100

The 'trick' is in the way you do things in your head, in words, not in numbers.
Most people tend to break the numbers down, for easier recall, such that:

Add 1000. = 2,040 => Twenty Forty
Add 30 = 2,070 => Twenty Seventy
and then add 1000. = 3,070 => Thirty Seventy
Add 20. = 3,090 => Thirty Ninety
Add 1000 = 4,090 => Forty Ninety
and then add 10. = 4,100 => Brain 'complains'. The last numbers in your head were Forty Ninety, +10 becomes Forty One Hundred = The brain automatically ticks over and resets the count to 0, and increases to Fifty in your head, because of the break-down to 'simpler' numbers, the brain fails to recognise Forty One Hundred as a real number.

For those that added it in full, i.e. One Thousand and Forty + ....., tend to get the correct answer of 4,100

20. OP

### Akari_32Fishlore LegendMember

I tried that, too, but I guess I didn't do it right (but I'm not a math whiz. My TI-89 is my best friend LOL)