Count the Corners is a free printable Grade 1 maths worksheet on counting vertices, aligned to Common Core standard 1.G.A.1. It prints 6 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
1.G.A.1
How many corners does each shape have?
LessonPrint · 1.G.A.1 · Set 1 · free to copy for classroom use
Set 1. Prints on its own sheet.
It practises counting vertices — 6 questions for Grade 1, all on Common Core 1.G.A.1: Know what makes a shape that shape — sides and corners, not colour or size. The instruction to pupils is “How many corners does each shape have?”, and the answer key follows on the next sheet.
CCSS.MATH.CONTENT.1.G.A.1 — 1.G.A.1, in the Geometry domain for Grade 1. The published standard reads: “Distinguish between defining attributes versus non-defining attributes; build and draw shapes to possess defining attributes.” The worksheet assesses that standard rather than a paraphrase of it.
Count the Corners is written for Grade 1, typically ages 6-7. It is one of the sheets on 1.G.A.1, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.
Yes. All 6 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.
25 — one per pupil, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.
Yes. Count the Corners, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.
Yes — “What Makes a Shape That Shape” is a 40-minute Grade 1 plan for 1.G.A.1, timed section by section, with the misconceptions to expect and an exit ticket. Count the Corners is the practice that follows it.
Know what makes a shape that shape — sides and corners, not colour or size.
Teaching this next? What Makes a Shape That Shape is the 40-minute plan for it, with the misconceptions to expect.
Last reviewed 2026-09-05. Aligned to 1.G.A.1 of the Common Core State Standards for mathematics.