Number bonds to 20, adding and subtracting within 20, and simple missing-number problems.
25 August 2026 · 4 min read
Year 1 addition and subtraction is almost entirely about small numbers, done confidently — not written methods, which come later. The goal is fluency: a child who can add and subtract within 20 without having to work everything out from scratch each time.
Knowing that 6 + 4 = 10 instantly, rather than counting it out each time, sounds like a small thing, but it's the building block for almost every calculation strategy that comes later — including the "make 10" strategy used constantly in Year 2 and beyond (7 + 5 becomes 7 + 3 + 2, using the bond to 10 as a stepping stone). A child who's secure on bonds to 10 and 20 has a toolkit; a child who isn't ends up recalculating from scratch every time, which is slow and tiring even when the answer is ultimately correct.
One of the clearest signs of growing fluency is a shift from "counting all" (counting out 6 objects, then 4 more, then counting the whole group from 1) to "counting on" (starting at 6 and counting up 4 more: 7, 8, 9, 10). It's the same answer either way, but counting on is faster and marks a real step forward in number sense — it's worth noticing and encouraging when you see it.
Subtraction tends to cause more hesitation than addition at this stage, particularly when it's phrased as "find the difference" rather than "take away" — the two can feel like different operations to a Year 1 child even though they're mathematically the same. Missing-number problems (7 = ? − 9) also cause more trouble than they should, mostly because the unfamiliar layout — the answer isn't at the end — throws children who are used to reading left to right and writing the answer last.
Little and often works better than long sessions for this age group. A few quick bonds-to-10 questions while getting dressed, or a "how many more to make 20?" game with everyday objects, does more for genuine fluency than an occasional worksheet. If your child solves things by counting on fingers, that's not a problem in itself — it becomes worth watching only if the same reliance is still there many months later without any sign of moving towards recall.
Grasp Maths tracks number bonds and simple addition/subtraction as distinct skills, and notices the difference between a child who's counting on confidently and one who's still counting from scratch — so practice targets exactly where fluency hasn't quite formed yet.
Looking for printable practice too? See our Year 1 maths worksheets, or read the full Year 1 maths overview.
Try a free Grasp Maths practice session, matched to the Year 1 curriculum.