Max Maths, Year 4, Learn together, Multiplying 2-digit numbers with regrouping (1)

In a Year 4 mathematics lesson, the concept of multiplying 2-digit numbers with regrouping is introduced. The lesson starts with a practical question to capture the students' interest: "There are 12 balls of wool in a box. How many balls of wool are there in 6 boxes?" To solve this, the students are taught to multiply the number of balls in one box by the total number of boxes. This real-world example helps to contextualise the mathematical operation for the students and makes the abstract concept of multiplication more tangible. The lesson utilises visual aids such as counting blocks to represent the numbers, which aids in understanding the process of grouping tens and ones.

The next step involves the technique of regrouping, which is crucial when dealing with larger numbers in multiplication. The students learn to regroup 10 ones into 1 ten to simplify the multiplication process. For instance, when multiplying 6 by 12, the calculation is broken down into 60 (representing 6 tens) and 12 (representing 6 ones), which are then added together to get the final answer. In this example, the students would find that there are 72 balls of wool in 6 boxes. By breaking down the problem into smaller, more manageable parts, the lesson aims to build confidence in the students' ability to multiply 2-digit numbers with regrouping.