66 plus 98 equals 164. This is because addition is a basic arithmetic operation where two numbers are combined to find their total sum. In this case, when you add 66 and 98 together, you get 164 as the result.
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66 + 98 = 164.
Note: simple calculations like this one are easier to do with a calculator. If you don't have a calculator available, your computer probably has one for you to use (check under "Programs", "Applications", etc).
66 plus 66 equals 132
49 + 66 + 132 + 31 = 278
98 plus 65 equals 163.
66 + 99 = 165
It might be possible to work this in your head. Your 98 is 100 minus 2. This means 98 plus 98 is 100 plus 100 minus 2 minus 2. That's 200 minus 4 which gives 196 as the answer.