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2 cards from this section. Quick, good the night before a test.
Is the sum of 2/3 and 1/3 a rational number?
Add the fractions.
Do rational numbers include negative values?
Think of fractions.
Are rational numbers closed under addition?
Think of how fractions add up.
Is subtraction commutative?
Consider the expression 5 - 2 vs 2 - 5.
Create your own set of rational numbers and demonstrate addition and multiplication with three numbers to show closure.
Use the LCM to add the fractions.
Explain with examples how the associative property differs between addition and subtraction.
Draw out the calculations for clarity.
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