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Step-4

Title: Percentage

Grade: 1300-a Lesson: S4-L1

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	A student multiplied a number by 60 instead of 80. What is the percentage error in the calculation?
2	Step	Correct Calculation	\$x \times 80\$
3	Step	Incorrect Calculation	\$x \times 60\$
4	Step	The difference between these two calculations is:	\$80x - 60x = 20x\$
5	Hint	\$"Difference"/"correct result" \times 100\$
6	Step	Substitute the values	\$"20x"/"80x" \times 100\$ ⇒ \$25%\$
7	SumUp	Can you summarize what you’ve understood in the above steps?
8	Choice.A	This option is incorrect because the error is not half of the correct value, it’s one-fourth (25%)	50%
9	Choice.B	This option is incorrect. because, it doesn’t accurately represent the error. The error is 25%, not 30%	30%
10	Choice.C	This option is correct because it accurately represents the percentage error in the calculation	25%
11	Choice.D	This is incorrect because the error is not 75% of the correct value; it’s actually 25%	75%
12	Answer	Option	C
13	SumUp	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

A student multiplied a number by 60 instead of 80. What is the percentage error in the calculation?

Step

Correct Calculation

\$x \times 80\$

Step

Incorrect Calculation

\$x \times 60\$

Step

The difference between these two calculations is:

\$80x - 60x = 20x\$

Hint

\$"Difference"/"correct result" \times 100\$

Step

Substitute the values

\$"20x"/"80x" \times 100\$
⇒ \$25%\$

SumUp

Can you summarize what you’ve understood in the above steps?

Choice.A

This option is incorrect because the error is not half of the correct value, it’s one-fourth (25%)

50%

Choice.B

This option is incorrect. because, it doesn’t accurately represent the error. The error is 25%, not 30%

30%

Choice.C

This option is correct because it accurately represents the percentage error in the calculation

25%

Choice.D

This is incorrect because the error is not 75% of the correct value; it’s actually 25%

75%

Answer

Option

SumUp

Can you summarize what you’ve understood in the above steps?