Missing Addend Worksheets Within 20

About this resource

Finding a missing addend within 20, on pages a child can pick up and start. Count the empty boxes in a ten-frame,

hop a number line between a ring and a flag, fill a plain equation, or turn a fact around — the blank is always one

of the two numbers being added, never the total. Every page has a big "My name" line, one short instruction, and

answer boxes made for a child's handwriting. Untimed: no clock, no score on the page.

EVERYTHING INSIDE (32 pages: 16 student pages, 16 for you)

• 70 different missing-addend facts, sums from 3 to 20, all computed in code; each fact appears on exactly one student page
• Show Me: one missing addend shown four ways (count the gap, number line, fill the box, turn it around), then a Your turn row where the child picks two numbers that make the same total (1 page)
• Count the Gap: a ten-frame holds the known addend; the rest of the frame is empty and dashed for the child to count (10 problems, 2 pages)
• Fill the Box: After — plain equations, known + box = total, the blank always the SECOND addend (15 problems, 3 pages)
• Fill the Box: Before — plain equations, box + known = total, the blank always the FIRST addend (11 problems, 2 pages)
• Hop to Find It: a 0 to 20 number line rings the start and flags the end; the hops are printed as a scaffold on the first page, drawn by the child on the second, and left to find on the third (11 problems, 3 pages)
• Turn It Around: the same two numbers shown both orders, two boxes to fill on every row (11 problems, 3 pages)
• Cut and Glue: six pieces a page, 3 by 2, three straight cuts; numbers glued to equations on the first page, equations glued to numbers on the second (12 pieces, 2 pages)
• A fact map showing every one of the 90 possible facts and which page carries it, 2 answer keys, a tracker, a class grid, a team note, a home page with a printed number line and blank equations for the family to fill in, a filled example (an invented student), a phrase and strategy bank (17 starters), a binder cover and 6 divider tabs with a spine label
• Start Here, a how-it-works page and a "What's next" back page

Built For The Child, Not The Office

Every student page has a big "My name" line, one short instruction with a picture (a pencil or scissors), rounded

boxes at least half an inch tall, and plenty of room. Fill the Box: After, level 3, adds a "My work" box.

Everything for you (directions, answer keys, scoring) is on separate teacher pages.

Three Levels, Marked By Dots

One dot: starting (totals stay small, a ten-frame or a scaffold line is always on the page). Two dots: building.

Three dots: ready for more (bigger totals, draw your own hops, show your work, glue the equations to the numbers).

The dots are the only level code, so children at one table are not comparing papers.

Every Fact Is Computed

Every answer, every empty cell, every hop and every row of both answer keys is read from the same pair of numbers

that draws the page. There is no second, hand-typed key. A fact is the unordered pair of addends, so showing

7 as the known number with 5 missing on one page, and 5 known with 7 missing on another, would still be the same

fact — blocked in code, not just by eye.

Type In, Or Print

The name and date lines, every answer box, the tracker, class grid, team note and home page are type-in fields in

any PDF reader; the pictures, number lines, ten-frames and cut pieces are always printed. Every page also prints

clean in black and white. This is a fillable PDF; it is not a Google Slides, Google Docs or PowerPoint file.

Who This Is For

First and second grade teachers, special education and resource room teachers, interventionists, and anyone who

needs missing-addend practice at more than one level in one file, with the tracking and family pages already made.

What This Is, And What It Is Not

An untimed missing-addend practice set with the record-keeping around it. It is not a timed fluency probe or a

goal page, not a full math curriculum, and not a claim about any student's age, grade level or rate of progress.

No page asks for a total; this is not a "find the sum" addition-practice file.

Also From Bright Path Sped

Addition Within 20 Worksheets (the same fact family, mostly finding the total; this pack is 70 facts of addend practice alone), Equal

Sign Worksheets, True or False Equations (what the equal sign means), Missing Numbers Worksheets (the sequence

version of a missing number), and Addition Within 20 Progress Monitoring Probes (the data side of this skill).