Little Learners · Ages 5 to 7
Missing Addend Fill-in
Find the number that completes each equation. Five levels of printable missing addend practice with answer keys.
The learning journey
Every activity is one step. Here is where this one fits.
- PlayLearn the idea in a game
- Practise(you are here)Lock it in on paper
- ReviewCome back and keep it sharp
- MasterTake on a harder challenge
- AchieveEarn a certificate
About Missing Addend Fill-in
A missing addend question is the first algebra a child ever meets. Seven plus something equals twelve asks for an unknown, and the child who can answer it has understood that addition and subtraction undo each other — which is a genuinely different piece of knowledge from being able to add. This worksheet builds that understanding by rotating which slot is blank. Some lines hide the second number, some hide the first, so a child cannot fall into the habit of always subtracting the visible number from the total without thinking about why that works. That rotation is the whole design: a page where the blank is always in the same place trains a procedure, while a page where it moves trains the relationship. Totals and addends widen across the five levels, moving from small sums a child can check by counting up to facts within twenty that reward knowing their bonds. Twelve questions per page in two columns. Each level prints as a clean A4 sheet in black and white and downloads with its own separate answer key. Its on-screen twin is Missing Addend Detective.
Common questions
- Why does the blank move around?
- A page where the blank is always in the same place trains a procedure. A page where it moves trains the relationship between addition and subtraction.
- Is this really algebra?
- It is the first form of it. Solving for an unknown is the same idea a child will meet again with letters.
- How large do the numbers get?
- They start small enough to check by counting and reach facts within twenty at the higher levels.
- Is an answer key included?
- Yes. Every level downloads with its own separate answer key PDF.
A hand for grown-ups
- Before you start
- Have something countable nearby. Being able to check "3 and 2 really is 5" by counting builds trust in the maths.
- While they work
- If a sum is hard, suggest counting on from the bigger number rather than counting both from one. It is a real strategy, not a crutch.
- Afterwards
- Try one together out loud, talking through how you worked it out. Hearing an adult think aloud is genuinely useful.
- Watch out for
- Counting both numbers from one every time. Nudge gently towards "start at the bigger one and count on".
- Away from the screen
- Add up small shopping items, or dots on two dice. Board games with dice are addition practice in disguise.
Where to go next
Chosen by the skills this activity practises.