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Schools and Education General Discussion
Reply to "Order of operations -- help me"
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[quote=Anonymous][quote=Anonymous]5th grade math: "simplify the expression below" (I'm using a "^" to show an exponent b/c I don't know how to do the superscript font) 1. 6^2 - 4* (7-4) I thought it would be 36-4 * (7-4) ----> 32 x 3 2. 5^2 - 4* (5-3) I thought ti would be 25 - 4 x (2) ----- 21 x 2 = 42 But DC got it wrong. The other options for answers were (a) 2, (b) 8, or (c) 17. Help. ???[/quote] The mistake you made was subtracting before multiplying - in both problems. First problem - start with the parenthesis. Now, you have 6(squared) - 4 *3. Now, do the exponent. Now, you have 36 - 4 * 3. NOW, you multiply first because multiplication comes before subtraction. 36 - 12 The PEMDAS helps, but if you have BOTH addition and subtraction in a problem or BOTH multiplication and division in a problem, then you do the arithmetic from left to right. [/quote]
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