Column addition and subtraction challenges

For the past  three weeks, the children have been developing their skills in adding and subtracting 3 digit numbers. At first, the children used concrete manipulatives (like Base Ten) and then they progressed to drawing diagrams to represent their understanding. This week, we have been focusing on formal written methods of column addition and subtraction and on reasoning problems involving these mathematical operations. The children practise lots of examples before carrying out the calculation in their Mathematics books. Here are some of the children really getting down to business with their column addition and being rightly pleased with themselves for their correct answers!