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Evaluate the given expression. 19−20÷4
1
24
19
14
14
Apply the BODMAS rule: perform division before subtraction. First, compute 20÷4=5, then subtract from 19.
Expression to evaluate: 19−20÷4
BODMAS / PEMDAS Rule: Division precedes Subtraction
Apply the BODMAS rule: perform division before subtraction. First, compute 20÷4=5, then subtract from 19.
Students often make the mistake of performing subtraction first (19−20=−1), and then dividing by 4, which yields an incorrect result.
Step 1: Understand BODMAS Rule
According to the order of operations (BODMAS/PEMDAS), division must be performed before subtraction.
Order: Division (÷) before Subtraction (−)
Step 2: Perform Division
Divide 20 by 4: 20÷4=5
20÷4=5
Step 3: Perform Subtraction
Substitute the result back into the expression: 19−5=14
19−5=14
D is correct because evaluating the expression 19−20÷4 using the BODMAS rule gives 19−5=14.
Order of operations is fundamental across all branches of mathematics, especially when simplifying algebraic expressions and solving equations.
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