What this page practices
Every worksheet here is Addition at the Missing Number level, built specifically for Grade 1. The number range and problem format are matched to what Grade 1 actually covers for this skill — not a generic difficulty label, but the real range researched from Common Core's grade-by-grade progression and cross-checked against what established publishers put in front of students at this stage. A worksheet labeled Missing Number here means exactly that skill, at exactly this grade's range, every time.
How to read a worksheet on this page
Problems here use one of two layouts, chosen for what the skill actually needs, not for variety's own sake. A horizontal row ("5 + 2 = ▢") is built for straightforward fact practice — quick to scan, quick to solve. A vertical, stacked layout — the number on top, the operation and second number below it, a line, then the answer box — is used specifically where place-value columns lining up is the actual point, most often in regrouping (carrying or borrowing). If this page uses the stacked format, that's a deliberate signal about what skill is being tested, not a style choice.
Fresh numbers, same skill, every variant
Every numbered worksheet below tests the exact same Missing Number skill with a different, deterministically-generated set of numbers — so a child who needs more repetition can work through several variants without ever seeing the identical page twice, and a teacher can hand two students different-looking pages while both practice the same thing. The rule itself never changes across variants; only the concrete numbers filling it in do.
What counts as actually understanding this skill
Getting one problem right can happen by luck, especially with a narrow number range. Getting several right in a row, across different numbered variants, with a child able to explain their process rather than just stating an answer, is the real signal that Missing Number has actually stuck — not just that this particular page happened to go well.
Printing and using this page
Every worksheet downloads as a clean PDF in both Letter and A4 sizes automatically. For a classroom, this specific skill page is the right tool when a group of students needs focused practice on exactly Missing Number rather than a broader review — hand out a couple of different numbered variants so no two students are working from the identical page. At home, work through a couple of rows at a time and ask a child to explain their reasoning before checking the answer, rather than racing through the whole sheet at once.
Where to go from here
Once Missing Number feels solid across a few different numbered variants, the hub page above lists every other skill available for Addition at Grade 1, so it's straightforward to move to the next one without hunting through menus. There's no required order beyond what a specific child is ready for — moving on before a skill is genuinely automatic usually just means more time spent relearning it later.
A quick way to check readiness before printing a full page
Before handing over a whole worksheet, it's worth trying one or two Missing Number problems out loud first, with a child talking through their steps rather than writing silently. If they can walk through the reasoning correctly, even slowly, printing the full page is a smooth next step. If the spoken version is already a struggle, that's useful information before an entire page gets filled in incorrectly — it usually means the hub page's other, earlier skills are a better use of today's practice time than this one.
Free, printable, and nothing saved
This worksheet follows the same rule as everything else on this site: free to view, free to download as a PDF, and free to print as many times as needed — no account, no email capture, and no premium tier hiding a specific skill behind a paywall. Nothing typed or clicked here is saved anywhere, matching the same no-account, nothing-stored model this entire site is built around.