11 - 12 in numbers for kids = -1
The numbers are -12, -11, -10 and -9.
12
12 and 1
You can select 12 numbers for the first digit, 11 numbers for the second digit, and 10 numbers for the third digit; so 12*11*10 = 1320 sets of 3 numbers can be made out of 12 different numbers.
11
23
There are three modes: 11, 12 and 13
11 and 12
5/11
The numbers are -1 and -11 because -1 times -11 = 11 and (-1)+(-11) = -12
11 and 12 11² = 121 12² = 144
11, 12 or 13 (12 is stable).