11 x 100 = 1100
11 times 100 is 1100. The eleven times table has a shortcut of its own: multiply by 10, then add the original number back. 100 x 10 = 1000, plus 100, gives 1100.
11 × 100 = 1,100
Adding 11 to itself 100 times gives the same answer.
The eleven shortcut
Every multiple of 11 is the number times 10 plus the number again. For 100 that is 1000 + 100 = 1100. The same move handles 11 x 23 as 230 + 23 = 253, or 11 x 47 as 470 + 47 = 517. It is the reason the eleven row is where most people stop reciting the table and start calculating.
Checking a multiple of 11
Alternate plus and minus across the digits: 1 – 1 + 0 – 0 = 0. A result of zero, or any multiple of 11, means the whole number divides by 11. Here it does exactly: 1100 divided by 11 is 100.
Not the same as
- 11 x 10 = 110, one zero short
- 100 + 11 = 111
- 11 squared = 121
Nearby answers
The row continues with 100 x 12 = 1200 and 13 x 100 = 1300. Every pair on the site is listed on the multiplication index.