Add up and Reckon

Add up verb - Add up in number or quantity.

Reckon is a synonym for add up in activity topic. In some cases you can use "Reckon" instead a verb "Add up", when it comes to topics like list, add, calculate, count.

Reckon verb - To determine (a value) by doing the necessary mathematical operations.

Add up is a synonym for reckon in count topic. You can use "Add up" instead a verb "Reckon", if it concerns topics such as enumerate.