L4 Multiply 2-Digit by 1-Digit Numbers Mentally

This Year 3 Maths resource focuses on multiplying 2-digit numbers by 1-digit numbers using a variety of mental strategies, helping children build confidence and fluency in calculation. The lesson begins with a starter that revisits addition, subtraction, and partitioning of 2-digit numbers into tens and ones, showing how breaking numbers apart can simplify mental multiplication. The introduction guides children through key strategies for mental multiplication, including using known times-table facts, partitioning numbers, doubling, and rounding to “friendly numbers.” Concrete resources like Base 10 blocks can be used to support understanding, but the emphasis is on performing calculations mentally for efficiency. The main activity consists of word problems presented on sticky labels, which children solve in their maths books while identifying the mental strategy they used. This allows them to compare different strategies and see which approach is most efficient depending on the numbers involved. In the plenary, children discuss different strategies used by peers and reflect on which method works best. Key questions prompt children to think critically about partitioning, doubling, and the use of times-table facts to make mental calculations easier. Ideal for Year 3 teachers, this resource develops mental calculation skills, reinforces times-table fluency, and encourages children to choose the most effective strategy for multiplying 2-digit numbers by 1-digit numbers.