Magic Half Square Ruler

This is a unique ruler designed to help you with the half-square triangle. This ruler has all the math built into the ruler so you don't have to think about how much to add. All you have to know is the finished size of the block. You can also use this ruler to square up the blocks. Mace Mc Eligot of Mace Motifs put a lot of thought and knowledge into this ruler when she was designing it. When you only have a few blocks to make this is simple, efficient and quick.

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