How do I find the answer to (10/11)² - 1/11 • 1 1/12= ? No matter how I work it I'm told my answer is wrong. Note: 99 119/132 isn't the answer. I got that by (10/11)² = 100/121, 1/11 • 1 1/12= 13/132, so 100/121 - 13/132 = 99 119/132
Please note that your last computation, 100/121 - 13/132 = 99 119/132 is where you went wrong.
You final result, 99 119/132, you would get from, 100 - 13/132 = 99 119/132.
It looks as though you simply forgot to divide by 121!
The answer is:
100/121 - 13/132 = (100*132 – 13*121) / (121 * 132)
100/121 - 13/132 = (13200 – 1573) / (15,972)
100/121 - 13/132 = (11,627) / (15,972) = 1057/1452 (take out a factor of 11, top and bottom)
Answer: 1057/1452