Multiply by ten and add one of the number.
7 x 11 = 70 + 7
23 x 11 = 230 + 23 = 253.
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11,011 is how you write eleven thousand eleven
Only one and eleven. Eleven is a prime number. Prime numbers are divisible by one and themselves only.
(-15) x 4 = -60 -15 + 4 = -11 ~Jason
They are: 11,000+1,100+11 = 12,111
The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).