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## To calculate 90 plus 2 divided by 7.89, you can follow the order of operations, which is commonly known as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right).

First, perform the division of 2 by 7.89: 2 Ă· 7.89 = 0.253164557

Finally, add 90 to the result: 90 + 0.253164557 = 90.253164557

Therefore, 90 plus 2 divided by 7.89 equals 90.253164557.

As for the calculation 11111111 times 111111111, the product is 1,234,567,643,209. To verify this, you can input the numbers into a calculator and perform the multiplication.