Mastering Mental Math Skills

The order of operations is a set of rules that determines the sequence in which calculations are performed. The acronym PEMDAS is often used: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

$$26$$

$$2,110$$

$$1,245$$

$$8,000$$

$$2,211$$

Rounding a number means adjusting it to a nearby specified value, often to make it simpler or easier to work with. For example, rounding 7,642 to the nearest thousand gives 8,000.

One strategy is to break the numbers into smaller, more manageable parts. For example, to add 1,234 and 876, you can add 1,200 + 800 and then 34 + 76.

Addition is the process of finding the total or sum by combining two or more numbers, while subtraction is the process of finding the difference between numbers by taking one number away from another.

A common mistake is to forget the order of operations, leading to incorrect results. Always perform multiplication before addition or subtraction.