WEBVTT
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Evaluate 27 plus 29 plus 73 using the commutative and associative properties.
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The community property allows us to change something from π plus π to π plus π, switch around the order.
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The associative property allows us to add different numbers together first, but still with the same total.
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So we can take π plus parenthesis π plus π or we would need to add π and π together first.
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And it will actually be the exact same thing as taking π plus π inside the parenthesis, adding those together first then adding π.
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And we would still get the same number.
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So here we have our expression: 27 plus 29 plus 73.
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So weβre supposed to evaluate this using the commutative and associative properties.
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So letβs first begin by using the commutative property.
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Using the commutative property, we can use the commutative property to switch the order of adding the 73 and 29.
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So instead of having 27 plus 29 plus 73, we can have 27 plus 73 plus 29.
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And the associative property states as long as weβre adding or multiplying β but in this case weβre adding β we can add whichever two numbers together we would like first.
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So looking at the original expression, we would think we would add 27 and 29 together first.
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But here we can see weβre actually going to be adding 27 and 73 first, because theyβre inside the parentheses.
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So, 27 plus 73 is equal to 100, and 100 plus 29 is equal to 129.
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Therefore, 129 will be our final answer.