Smart Starters · Ages 8 to 10
Addition Square Grid
Complete a 6×6 addition square by adding the row and column headers. A Grade 3 addition-fluency grid 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 Addition Square Grid
Addition Square Grid builds rapid addition fluency through a satisfying complete-the-table challenge. Each cell of the 6×6 grid is the sum of its row and column headers, and the child fills in the missing cells, rehearsing dozens of addition facts in a single focused activity. Grids like this are a favourite of teachers because they reveal the structure and patterns of number — children quickly notice that values increase steadily along each row and column — while giving a huge amount of practice in a compact space. Quick, accurate addition is a foundational Grade 3 expectation across the US, UK, Canada and Australia, and the grid format keeps that practice purposeful rather than repetitive. The five levels hide more of the grid as confidence grows, so the same layout keeps offering a fresh challenge. Each page prints cleanly on a standard A4 sheet, and every level downloads with its own answer key giving the value of every hidden cell. There is no advertising, no sign-up and no data leaves the device. Use it for addition fluency or alongside our addition games for the same age range.
Common questions
- How does the grid work?
- Each cell is the sum of its row header and column header.
- What grade is this for?
- Grade 3 learners aged 8 to 9.
- Is an answer key included?
- Yes, every level gives the value of each hidden cell.
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.