When making the Redwork Woodland owl quilt I had to determine the number and best size to cut and stitch strips to fit the border of the quilt.
I wanted it to have an odd number of pieces so that the border ended with a dark coloured piece on each end of the strip
Once again I used the formula, this time working backwards.
Number of strips/ units= (Required border/strip length - 0.5) ÷ (strip/ unit width - 0.5)
Example 1
I need strips to make a border that is 40 1/2 inches long and I would like to use 2 1/2 inch wide strips.
I need strips to make a border that is 40 1/2 inches long and I would like to use 2 1/2 inch wide strips.
The calculation is:
(40.5 - 0.5)
÷ ( 2.5 - 0.5)
= 40 ÷ 2
= 20 strips
= 40 ÷ 2
= 20 strips
I would like to make an odd number of strips so I will make the strips a little smaller 2 1/4 inches
(40.5 - 0.5) ÷ ( 2.25 - 0.5)
= 40 ÷ 1.75
= 22.8 strips
That is just a little under 23 so we will round up to 23 and that will give me the number of strips.
= 40 ÷ 1.75
= 22.8 strips
That is just a little under 23 so we will round up to 23 and that will give me the number of strips.
Example 2
I need to have a border of 65 inches long and I would like to make 3.0 inch pinwheels blocks
(65 - 0.5) ÷ (3.0 - 0.5 )
=64.5 ÷ 2.5
= 25.8 pinwheels which we will round up to 26 pinwheels.
=64.5 ÷ 2.5
= 25.8 pinwheels which we will round up to 26 pinwheels.
Example 3
If my border was 90 inches long and I wanted to put in 5 inch pinwheels,
The number I need is
(90 - 0.5) ÷ (5.0 - 0.5)
= 89.5 ÷ 4.5
= 19.9 or rounded up 20 pinwheels.
= 89.5 ÷ 4.5
= 19.9 or rounded up 20 pinwheels.
I have included a fraction to decimal conversion table for common values
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