The secret to learning how to make a log cabin block is to start out with a bigger square for the middle, say 4 inches, then use wider strips, 2 inches in 3 different colors plus the white.
When you cut the strips, measure the two inches on the length of the fabric you use, then cut your strips selvage to selvage. Do not cut into lengths. Attach as picture indicates, going round the square.
Good Luck!
12 inch Log Cabin Block
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