
Triangle in a Square Ruler by Quilt in a Day
A great solution for your needs. Free shipping and easy returns.

Square in a Square Mini Technique Book Plus Ruler: Provides Instructions Plus Tool for 4 Options, 7 Patterns, and 4 Mini Blocks
A great solution for your needs. Free shipping and easy returns.

You’ve Got a Point!: Stunning Quilts with Triangle-in-a-Square Blocks
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In Love with Squares & Rectangles: 10 Quilt Projects with Batiks & Solids from Blue Underground Studios
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Granny Square Fashions for Babies and Toddlers: Stitch patterns in words and symbols plus 5 projects
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June Tailor Quilt As You Go Express Square in a Square Quilt Pattern
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Related Images for Square In A Square Pattern

Squares made of square tiles are also fun to make.
Become a member and get access to hundreds of free knitting patterns! membership is free, and easy.
They are not called "square numbers" but do follow an interesting pattern.
These free 8 inch square patterns are perfect for your charity projects.
Finished size 12" x 12" download instructions: click here to download a .pdf with these block instructions.