Review:
For this Unit you need to make sure you know the following:
- What it means to be a digit.
- How to express numbers in the 3 different formats.
- How to identify the place value of a digit in a number.
- The definitions of sum, product, factor, difference and quotient and the many different words that have the same meaning.
- How to add, subtract, multiply and divide whole numbers.
- All of the subtraction, addition, division and multiplication properties, and how to use them.
- Perimeter of a polygon.
- How to round and estimate whole numbers.
- How to find the area of a rectangle.
- How to find the mean of a set of numbers.
- The language of exponents; base, power (exponent) and square root.
- Order of Operations and how to use the rules.
- Solving Application problems.
Helpful Hints:
- It is very important to KNOW how to use the order of operations. Many students stumble using the acronym PEMDAS because the acronym suggest multiplication comes before division and addition comes before subtraction. Remember the rules are: multiply OR divide from left to right and add OR subtract from left to right.
- Remember perimeter uses the operation addition and area uses the operation multiplication.
- Commutative property means "order does not matter" for multiplication and addition, but does not work for division and subtraction.
- Associative property means "grouping does not matter" for multiplication and addition, but does not work for division and subtraction.
- The square root of a number means: What is the number that I can square to get the number under the radical. Just like subtraction undoes addition and division undoes multiplication the square root undoes squaring.
- You should memorize the perfect squares 1 through 13. Examples: 2 squared is 4, 3 squared is 9, 4 squared is 16 and so on. Note: 4, 9, 16...are the perfect squares.
- The "mean" is the statistical term for "average".