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Materials:
 Fabric in two contrasting colors
 Sewing machine
 Thread
 Rotary cutter or scissors
 Cutting mat
 Ruler
Instructions:

Cut the fabric pieces for the H quilt block. You will need two contrasting colors of fabric. Cut two strips of each color, 2 ½ inches wide by 12 ½ inches long.

Sew the strips together. Place one strip of each color right sides together, and sew along one long edge using a ¼ inch seam allowance. Repeat with the other two strips.

Press the seams. Press the seams to one side, either to the darker or lighter fabric. You should now have two strips, each made up of two colors.

Cut the strips into squares. Cut the sewn strips into squares that are 4 ½ inches by 4 ½ inches.

Arrange the squares. Arrange the squares in the shape of an H, with the two squares of one color in the middle and the squares of the other color on either side.

Sew the squares together. Sew the squares together in rows using a ¼ inch seam allowance. Then sew the rows together, again using a ¼ inch seam allowance.

Press the seams. Press the seams to one side.

Trim the block. Trim the block to 12 ½ inches by 12 ½ inches, making sure that all the corners are square.
Your H quilt block is now complete! Repeat these steps to make more blocks for your quilt.
The secret to the nine patch is all about ironing seams so that they butt when they are joined.
Cut 5 A squares and 4 B squares in the required size.
Chain piecing, join a B square to only 3 of the A squares, right sides together, with a 1/4 inch seam allowance. No need to press just yet.
The result will be:
Next, take the remaining A and B squares and, chain piecing, join them to these units, right sides together, with a one 1/4 inch seam allowance:
Your result will be:
To make this faster you can cut strips.
Cut A and B strips for the appropriate width, and join them into A/B/A and B/A/B units. Note you will need twice the length of B/A/B strips, as there are two of these units. Once your strips are joined, right sides together, with a 1/4 inch seam allowance. Press every seam towards the dark fabric.
Cut across your prejoined strips to create the units needed for the nine patch:
You will achieve the same result as above, but this method is faster.
To make a standard 9 patch, the width of the unit cut from prejoined strips is the same as the width of the original strips.
Press all the seams to the dark fabric so that all the seems butt up.
Join the B/A/B units to your A/B/A units with butted seams, right sides together, with a 1/4 inch seam allowance.
The direction of the final, central seam is optional. But guided by the placement of the block in the larger scheme, and wherever possible, iron to facilitate budding the seam joints.
Wider Application:
Just as the 4 patch, you can apply this methodology to all kinds of 9 patch blocks. As long as the patch has an underlying 3x3 grid, no matter how many pieces, the basic principle applies. It is repeated over and over, each 9 patch laying adjacent to the next 9 patch. As long as you keep pressing seams in pairs of opposite directions, piecing will be smooth sailing.
Try these out. Each block has an underlying 3x3 grid, and can be pieaced as a 9 patch.
Sometimes it is not obvious which direction is the dark with complicated blocks like those above. Just remember the basic ironing plan is:
How to Resize Quilt Blocks:
The first step in modifying any quilt block is to decide on the size of your finished quilt block. You can come to a decision based on a number of factors: doubling a pattern, cutting your pattern in half, or choosing the size based on your available fabric.
NOTE: When working from a pattern’s cutting instructions, make sure you remove the seam allowance before doubling or tripling the size. For instance, if your pattern calls for 31/2″ squares, first you’ll subtract the sum of the seam allowances (1/2″), double the finished block size (from 3″ to 6″), and add the seam allowance back in (1/2″). So, when all is said and done, you will cut a 61/2″ piece of fabric.
Resizing Square Blocks:
Square blocks are the easiest to resize. Simply add to your finished block measurement. For example, if you’d like your finished block to be a 4″ square, you’ll need to cut a 41/2″ square of fabric.
Resizing Rectangular Blocks:
Similarly to the square, for rectangle blocks, you’ll add to the length and width measurements of your finished block. If you’re doubling block that measures 3″ x 4″ in your quilt, you’ll cut a 61/2″ x 81/2″ rectangle of fabric.
Resizing HalfSquare Triangle Blocks:
When you want to change the size of a HalfSquare Triangle block, add 7/8″ to the desired finished block size. To make a 4″ finished block, you’d cut 47/8″ squares.
Resizing Quarter Square Triangle:
Since there are two cut lines and two seam lines in a QuarterSquare Triangle block you’ll need to add 11/4″ to the desired finished block size. For a finished block that’s 4″, you’d cut your squares 51/4″.