Short multiplication of two and three-digit numbers arrives this year. Here's where it most often goes wrong.
25 August 2026 · 4 min read
Year 4 extends the formal written method for multiplication to two and three-digit numbers, which means more carrying, more columns, and more places for a small slip to throw off the whole answer. Here's where it tends to go wrong.
Given 47 × 3 (which comes to 141), a child multiplies the ones first — 7 × 3 = 21, writes down the 1, carries the 2 — and then needs to remember to add that carried 2 to the tens calculation (4 × 3 = 12, plus the carried 2 = 14). Forgetting to add the carry is one of the most common Year 4 multiplication mistakes, and it produces an answer that's plausible-looking but wrong (121 instead of 141) — easy to miss without a habit of checking.
As numbers grow to three digits, keeping each digit in the correct column becomes genuinely harder to track, especially for children still developing neat, consistent handwriting. A digit written slightly out of place can shift an entire calculation, producing an answer that's wrong for reasons that have nothing to do with understanding the method.
When a column's product is a two-digit number, some children carry the wrong digit — writing the tens digit in the answer row and carrying the ones digit, rather than the other way round. This is a genuine procedural mix-up rather than a sign the times table fact itself is unknown, and it's worth checking for specifically rather than assuming a wrong final answer means the multiplication fact was wrong.
A child can follow the steps of short multiplication correctly by rote without understanding that they're really finding, say, 47 groups of 3 — which becomes a problem the moment a question is phrased differently (a word problem, or a question asking "is that answer reasonable?") rather than presented as a bare column sum to complete.
Slowing down and narrating each step out loud — "7 times 3 is 21, write the 1, carry the 2; 4 times 3 is 12, plus the 2 I carried is 14" — tends to surface exactly where a slip happens, far more effectively than watching a finished, wrong answer and trying to guess where it went off track. Estimating first (47 × 3 is a bit more than 45 × 3, or about 140) also builds the habit of noticing when an answer doesn't look right.
Grasp Maths distinguishes a carrying slip in the written method from a genuine times-table gap, since they look identical on the final answer but need completely different practice to fix.
Looking for printable practice too? See our Year 4 maths worksheets, or read the full Year 4 maths overview.
Try a free Grasp Maths practice session, matched to the Year 4 curriculum.