Year 3 - Subtraction across a 10

Date: 30th Oct 2024 @ 9:35pm

We used Base 10 to subtract 1's across a ten.  We had to 'exchange' a ten rod for ten 1's in order to subtract. We noticed that when we exchanged the tens, we still had the same amount, it was just represented differently. For example 126 can be represented as 1 hundred plate, 2 tens and 6 ones or it can be represented as 1 hundred plate, 1 ten and 16 ones.  Developing this understanding will help us when we start to subtract using the column method.