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Increase 10 stitches evenly across 80 stitches
The answer
In the round: [K8, M1] 10 times
Flat (balanced row): K4, [M1, K8] 9 times, M1, K4
Check: the round uses 80 stitches and ends with 90. The flat row uses 80 and ends with 90.
Markers (in the round): place a marker after stitch 8, 16, 24, 32, 40, 48, 56, 64, 72, 80 of the old round, then work each M1 just after a marker.
How it is worked out
You have 80 stitches and need 90, so you work 10 M1 moves. Each M1 is made between stitches, so all 80 stitches are plain: 80 ÷ 10 = 8 exactly, so every section is the same.
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Questions people ask
How do I increase 10 stitches evenly across 80?
Work 10 sections, each made of plain stitches and one M1. In the round: [K8, M1] 10 times. You end with 90 stitches.
How do I increase 10 stitches evenly in a flat row of 80?
Split one section between the two edges so the shaping sits away from the edges: K4, [M1, K8] 9 times, M1, K4. You end with 90 stitches.
Does it work for crochet?
Yes. Tap Crochet (US) or Crochet (UK) in the calculator on this page. A crochet increase uses 1 stitch of the row, so the plain counts change; the calculator works them out.