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You multiply the mantissas, and add the exponents. After that, you may wish to normalize. Example: 2x105 x 6x106 = 12 x 1011. Notice that I multiplied 2 x 6 to obtain 12, and that I added 5 + 6 to obtain the new exponent, 11. You may wish to normalize this result to 1.2 x 1012.
First, you have to line up the decimal places by converting the smaller number to the same exponent as the larger number. Then you can subtract them in the obvious way. For example, 3.78 x 105 - 4.61 x 103 = 3.78 x 105 - 0.0461 x 105 = 3.7339 x 105, because 4.61 x 103 = 0.461 x 104 = 0.0461 x 105.
They are whole numbers,counting numbers,integers,rational numbers,real Numbers,composite numbers,square numbers,positive numbers,2-digit numbers.
Numbers that are not prime numbers are called composite numbers.