In addition and subtraction we have discussed
1) Some ways of conveying the meaning of the operations of addition and subtraction to children.
2) The different models of verbal problems related to addition and subtraction that children face.
3) The importance of getting children to solve word problems from the early stages on.
4) Why children make errors while applying the algorithms for addition / subtraction.
5) How to help them understand the processes of 'carry-over' and 'borrowing', involved in these two operations.
6) How to enable children to improve their abilities to estimate the sum / difference of quantities.