GED Math: The Associative Property of Addition, The commutative Property of Addition

How do you remember the difference between associative and commutative?

The Commutative Property of Addition: a + b = b + a
When you commute back and forth to work... you go between two places.


The Associative Property of Addition: a + (b + c) = (a + b) + c
When you associate with friends at a party , it is always at least three.

What is the mode, median, and range of the following numbers?

2.63, 2.01, 2.63, 3.49, 2.45, 2.61

Mode: 2.63
Median: 2.61
Mode: 1.48

Usborne Dictionary of Math (Great for GED!)

More GED Help

GED Skill: Adding and Subtracting Decimals

Adding and subtracting decimals is similar to adding and subtracting whole numbers. However, when you add or subtract decimals, it is important that you line up the decimal points. Once your numbers are lined up properly, you can add or subtract just like you would whole numbers.

Problem: Sally went to the store and purchased a can of soda for 75 cents and a bag of chips for $3.99. She gave the cashier a $10 bill. How much change will Sally get back?

Answer: $00.75 + $3.99 = $4.74
$10.00 - $4.74 = $5.26(change)