Ten-Frame Count
Six ten-frames per page, each with a different number of dots filled in, and a blank box below each one for a child to write how many. The ten-frame itself — 2 rows of 5 — is deliberately the same layout used in real Kindergarten classrooms, because it teaches a child to see a quantity in relation to 5 and 10 ("that's a full row plus 2 more") instead of counting every single dot one at a time from scratch.
Why this comes before addition and subtraction
A child who can look at a ten-frame and immediately say "8" without recounting has the exact foundation Kindergarten's Math Worksheets addition and subtraction pages depend on — combining and separating small quantities assumes the quantities themselves are already meaningful, not just numerals to read.
Using this with a Kindergartner
Point at the frame and ask "how many full rows?" before asking for the total — building the habit of anchoring against 5 first makes the final count faster and less error-prone than counting dot by dot, and it's the exact skill this format is designed to build.