Answer:
1) In the second step, it was supposed to multiply 9 and 2 and 36 by 3 instead of adding 9 and 3 to each other because multiplication and division comes before adding, according to pemdas.
2) In the second step, they were supposed to multiply 6 and 4 instead of subtracting 27 and 6 because multiplication comes before subtraction, according to pemdas.
3)
(43 - 20) - 2 · 5
43 - 20 = 23
23 - 2 · 5
2 · 5 = 10
23 - 10 =
13
4) 81 ÷ (13 - 4)
13 - 4 = 9
81 ÷ 9
81 ÷ 9 =
9
5) 7 · 8 - 3 · 6 + 1
7 · 8 = 56
3 · 6 = 18
56 - 18 + 1
56 - 18 = 38
38 + 1 =
39
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Step-by-step explanation:
<h3>
Section 1: Explain the error in each problem below. </h3>
1) Pemdas says multiplication and division comes before adding, so you must solve the multiplication in the problem first before the addition.
2) Again, as pemdas says, multiplication comes first before subtraction, so you must solve the multiplication in the problem first before the sutraction.
<h3>Section 2: Simplify the following expressions. </h3>
3) (43 - 20) - 2 · 5
Pemdas says to solve the parenthesis first.
Now multiplication comes next (because there's no exponents).
Now subtraction.
4) 81 ÷ (13 - 4)
Pemdas says to solve the parenthesis first.
Now division comes next.
5) 7 · 8 - 3 · 6 + 1
Pemdas says to solve the multiplication first.
Now subtraction and addition.
6)
<h3>Section 3: Insert grouping symbols to make the statements true. </h3>
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P.S. I am updating
