19.05.20 – Maths – Adding three digit numbers cross boundaries.Good Morning Year 3. Today, we will be looking at adding but we will also be looking at what happens when we cross a boundary. Remember, you cannot have more than 9 in any one column, when this happens, you need to drop the ten or hundred below, this is represented by putting a 1 below the line. Remember, the second page is always slightly trickier. Have a go and sent to your teacher once done.