Which of the expressions below need to do division first before other operations?
A. 25 x 4 ÷ 5 x 3
B. 3 x 5 + 9 ÷ 4
C. 81 ÷ 9 - 5 + 3
D. 21 - 8 ÷ 13 + 5
A. 25 x 4 ÷ 5 x 3
B. 3 x 5 + 9 ÷ 4
C. 81 ÷ 9 - 5 + 3
D. 21 - 8 ÷ 13 + 5
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Which of the expressions below need to do division first before other operations?
A. 25 x 4 ÷ 5 x 3
B. 3 x 5 + 9 ÷ 4
C. 81 ÷ 9 - 5 + 3
D. 21 - 8 ÷ 13 + 5
C. 81 ÷ 9 - 5 + 3
To solve the following, we should follow the PEMDAS rule: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction.
A. 25 x 4 ÷ 5 x 3
25 × 4 ÷ 5 × 3
↓
100 ÷ 5 × 3
↓
20 × 3
↓
60
••••••••••••••••••••••••••••••••••••••
B. 3 x 5 + 9 ÷ 4
3 × 5 + 9 ÷ 4
↓
15 + 9 ÷ 4
↓
15 + 2.25
↓
17.25
••••••••••••••••••••••••••••••••••••••
C. 81 ÷ 9 - 5 + 3
81 ÷ 9 - 5 + 3
↓
9 - 5 + 3
↓
4 + 3
↓
7
••••••••••••••••••••••••••••••••••••••
D. 21 - 8 ÷ 13 + 5
21 - 8 ÷ 13 + 5
↓
21 - 0.6153846153846 + 5
↓
20.384615384615 + 5
↓
25.384615384615
Notice that in Letter C., division was done first before they other operations. Therefore, the answer is C. 81 ÷ 9 - 5 + 3
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