What do you get if you multiply 111,111,111 by 111,111,111?

Question

Well??

Answer 1

111,111,111*111,111,111 =12345678987654321
actually, its a pattern... quite iinteresting..
1*1=1
11*11=121
111*111=12321
1111*1111=1234321
11111*11111=123454321
111111*111111=12345654321
1111111*1111111=1234567654321
11111111*11111111=123456787654321
111111111*111111111=12345678987654321
you can get the answer just by counting the number of 1s in the numbers being multiplied..

Answer 2

1 x 1 = 1
11 x 11 = 121
111 x 111 = 12,321
:
:
111,111,111 x 111,111,111 = 12,345,678,987,654,321

Answer 3

You'll get 12 345 678 990 000 000, or 1.234 567 899 x 10^16 in standard form.

Answer 4

hmm...well, let a=111

then we have b = a + 1000 a + 1000000 a

now we can easily find b^2 using the trinominal theorem

finally put a=111 and lo, the answer cometh!

Answer 5

1 - 1
11 - 121
111 - 12321
1111 - 1234321
11111 - 123454321
111111 - 12345654321

You have the answer, it works for all these up to 111111111, but that is the last one

12345678987654321

Answer 6

I'd call it beautiful.
And there is plenty more in maths.
I hope you enjoy bumping into or finding some more.
Just ignore the rude comments, they probably wish they'd noticed first.

Answer 7

Well what can i say , are your a computer nerd? So you like binary 01010101101010 - so here is your answer in 0's and 1's .Look its in 111111110000000001 well i hope you can sleep now.

Answer 8

YOU get an F in math for not knowing how to multiply

Answer 9

1.234567899 x 10^16

Answer 10

A headache