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Half of them.
Do-it-in-your-head method: Length + width equals half the perimeter, ie 106; 106 - 8 = 98; half of 98 is 49 which is the width, making the length 57.
You divide it by 2, so the answer is 4.
11 - 8 and 1/2 = 2 and one half
Half of 8 = 4