Fluency and ease in adding whole numbers is useful to learn because it aids in calculations. Practicing regularly with this table improves mastery of addition up to 20 (with zero) before moving on to subtraction. Answers are included.
These are the three stages of progression in learning addition:
1. Counting strategies: Use objects or fingers to count verbally to determine the answer.
2. Reasoning strategies: Use known information to logically determine an unknown combination: for example the learner knows that 5 + 8 is 13, so 5 + 9 is one more, 14.
3. Mastery or efficient production of answers: Learners can determine the answers fast and accurately, without having to count with their fingers or objects and without having to reason to get the answer.