What's easy, simple, and comfortable? Adding and subtracting double digit numbers. What's notsoeasy, the opposite of simple, and definitely not comfortable? Fitting 18 clowns into a car. Luckily you'll only have to learn that second part if you enroll in clown school.

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Addition and Subtraction of Double Digit Numbers with Carrying 
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Addition and Subtraction of One Digit Numbers 
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Solving TwoStep Equations using Addition and Subtraction 
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Single Digit Addition with Carrying 
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