You can either turn it back to decimal, calculate it and turn it back to quaternary. Or you can draw a simple times table in Base 4:
x 1 2 3
1 1 2 3
2 2 10 12
3 3 12 13
Then, when you multiply normally, like 1230*20 and 1230*3 you will get 31200 and 10330 respectively. Add then up and you get 102130 in quaternary, or 1180 in decimal.
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Base and exponent are the two parts of a power. The base is the lower left, normal-sized, number. The exponent is the upper-right, small (i.e., superscript) number. For example, in: 34 3 is the base, 4 is the exponent. In the simplest case, a power specifies a repeated multiplication. The base tells you what number to multiply by itself, the exponent tells you how many times to multiply it. Thus, 34 = 3 x 3 x 3 x 3 (that is, multiply 3 by itself, using the number 4 times as a factor)
36
To convert the number 1023 from base 4 to base 10, you need to multiply each digit by 4 raised to the power of its position from right to left, starting at 0. In this case, the calculation would be: (1 * 4^3) + (0 * 4^2) + (2 * 4^1) + (3 * 4^0) = 64 + 0 + 8 + 3 = 75. Therefore, the number 1023 in base 4 is equal to 75 in base 10.
4! - sqrt(4)*sqrt(4)/4 = 23
Multiply the length by the width. In this case, you multiply 4 by 3 and you get 12 square feet.