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We write the exercise in fraction form:
We break down 60 into a multiplication exercise:
We simplify the 3s and obtain:
We break down the 5 into a multiplication exercise:
We simplify the 5 and obtain:
\( 100-(5+55)= \)
The parentheses tell you that 5×3 must be calculated as one unit first! Without parentheses, you'd go left to right, but parentheses override the normal order and group operations together.
Huge difference! 60÷5×3 = 36 (left to right), but 60÷(5×3) = 4 (parentheses first). The parentheses completely change which operations are grouped together.
Not necessary, but very helpful! Writing makes it crystal clear that everything in the denominator must be calculated first before dividing.
Use PEMDAS: Parentheses, Exponents, Multiplication and Division (left to right), Addition and Subtraction (left to right). Parentheses always come first!
Yes! The explanation shows a clever method: , then cancel the 3s. This factoring approach helps you see patterns and avoid calculator errors.
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