I will try to post interesting math problems and troublesome topics for students.
Quick mental math. 11 X 22 = 242, 11 X 27 = 297, 11 X 45 = 495..... These are examples of multiplication of a 2 digit number by 11. To get the answer in your head, the first digit in the answer is the first digit in the number being multiplied by 11, the middle digit is the sum of the 2 numbers and the last digit is the last digit in the number. Another example.. 11 X 67.. first digit is 6 the sum of the digits is 13, so carry the one to make the first digit 7 and the middle digit 3, then drop the 7 to get 737.
Feel free to ask me any math question that comes up.