Max Maths, Year 4, Learn together, Subtracting 2- and 3-digit numbers using counting blocks and column method (2)

In the Max Maths Year 4 curriculum, students learn to subtract two- and three-digit numbers through hands-on and traditional methods. One of the exercises involves a practical scenario where Han initially has $168 and spends $62 on presents. To understand the subtraction process, students first use counting blocks to represent Han's original amount. They then remove blocks equivalent to the $62 spent on presents to visually see the subtraction in action. After crossing out the appropriate blocks, 106 blocks remain, indicating that Han has $106 left.

The lesson also introduces the column method as an alternative way to perform the subtraction. This traditional approach involves writing the numbers in a column, aligning the digits according to their place value (ones, tens, hundreds). Students then subtract each column starting from the ones place, moving to the tens, and if necessary, to the hundreds. By subtracting $62 from $168 using the column method, students arrive at the same answer of $106, reinforcing the concept that different methods can yield the same result and providing them with a reliable technique to check their work.