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Today's Lesson

Chapter 1: Whole Numbers and Decimals

Lesson: Proving theorems using figures in the coordinate plane

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Commutative property of addition: Changing the order of addends does not change the sum. For example, $4 + 2 = 2 + 4$4, plus, 2, equals, 2, plus, 4.

Associative property of addition: Changing the grouping of addends does not change the sum. For example, $(2 + 3) + 4 = 2 + (3 + 4)$left parenthesis, 2, plus, 3, right parenthesis, plus, 4, equals, 2, plus, left parenthesis, 3, plus, 4, right parenthesis.

Identity property of addition: The sum of $0$0 and any number is that number. For example, $0 + 4 = 4$0, plus, 4, equals, 4.

Commutative property of multiplication: Changing the order of factors does not change the product. For example, $4 \times 3 = 3 \times 4$4, times, 3, equals, 3, times, 4.

Associative property of multiplication: Changing the grouping of factors does not change the product. For example, $(2 \times 3) \times 4 = 2 \times (3 \times 4)$left parenthesis, 2, times, 3, right parenthesis, times, 4, equals, 2, times, left parenthesis, 3, times, 4, right parenthesis.

Click the Links below and Review. Note: If you have not joined the IXL site, you will have to clear your computers History after every lesson. Go into your History and check the box for IXL and delete the link. Now you can move on to the next lesson.