They are: 1*83 = 83
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There are none. The only factors of 249 are 1, 3, 83, 249.
83+7=90 and 83 and 7 are primes
They are: 83+2 = 85
Two: 83 and 89.
To multiply two digit decimal numbers, multiply the numbers as you would without the decimals. To put the decimal in the answer, count the number of decimal places in the two numbers and put the decimal in the answer that many places to the left. For example: 5.12 x 6.35 = 32.5120. If the numbers were 51.2 x 63.5, the answer would be 3251.20.