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To sew a Jacks on Six quilt block, you will need the following materials:
 Six 4 1/2 inch squares of fabric in two contrasting colors (three squares of each color)
 Sewing machine
 Thread
 Scissors
 Iron and ironing board
Here are the steps to sew the Jacks on Six quilt block:

Take one square of one color and two squares of the other color. Place the two squares of the same color on top of each other, right sides together. Sew a 1/4 inch seam along one of the edges.

Open up the two squares and place the square of the other color on top of one of the squares, right sides together. Sew a 1/4 inch seam along one of the edges.

Open up the three squares and press the seams with an iron.

Repeat steps 1 to 3 to make another set of three squares.

Take one set of three squares and place it on top of the other set of three squares, right sides together. Sew a 1/4 inch seam along one of the edges.

Open up the two sets of three squares and press the seams with an iron.

Take the sewn piece and place it on a cutting mat. Use a rotary cutter or scissors to cut the piece into four equal sections, cutting along the seams where the squares meet.

Arrange the four sections into a Jacks on Six pattern. The sections should form a square with the same color in each corner and a diamond in the center.

Sew the four sections together, matching the seams carefully. Press the seams with an iron.

Your Jacks on Six quilt block is complete! Repeat these steps to create as many blocks as you need for your project.
This is a great technique for making half square triangles that eliminates the need to directly manipulate the stretchy bias of the triangle. It utilizes two easy to cut squares producing two half square triangles.
On the back of the lighter fabric, draw a pencil line, diagonally from corner to corner.
Stack a pair of light and dark squares, right sides together. Sew a 1/4 inch seam allowance on each side of the line.
You will end up with something like this.
Now cut along the diagonal line.
Press the seam together to set the seam. Then press towards the darkest fabric.
To trim the block to the exact size line up the diagonal 45°angle with the ruler on your seam.
And then carefully trim your block with a rotary cutter.
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″.