MATHEMATICS REVIEWER
FOR 3RD GRADE
NUMBER AND OPERATIONS is a common core content. Common core content means it touches K-12 students.
The State expected 3rd grade student to master mental calculation, estimation, and paper and pencil addition of four digit whole numbers. This will help the student to validate the expected answer when their is no calculator available. But since everybody has a cellphone with calculator it is now easy to validate the answer.
Once the student master the concept of mental calculation, estimating, and paper and pencil calculation they will learn that there is a better method of doing computation that are efficient and accurate. Now they are ready to use regular calculator and online combine formula and calculator like invbat.com
Students are expected to make estimate appropriate to a given situation or computation with whole number.