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Basic Arithmetic

Please Excuse My Dear Aunt Sally (PEMDAS), she has the hardest time remembering how to make sense of these arithmetic rules...

Addition/Multiplication

Evaluate \[50-13 \times 3+20+7 \times 5.\]

Evaluate \[33 \div 11 \times 6 + 21 - 15 \div 5.\]

Evaluate \[-3 + 8 \div 5 \div 4 \times 10 + 7.\]

What is the value of \[ 4 \times 8 \div 4 \times 4 ?\]

Evaluate \[45+7 \times 3+5-7 \times 4.\]

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