Increase
25 turns into 50
100% increase
12 becomes 8
33% decrease
Mr. Huff thought there were 25 laptops. There were actually 26. What is his percent error?
3.8%
10 becomes 24
140%
What is the first step in all three types of problems.
Subtraction. Find the difference.
36 turns into 48
33% Increase
56 become 42
25% decrease
Jorge's mom told him to wear 2 pairs of socks. He actually wore 4 pairs of socks. What is his percent error?
50% error
8 becomes 5
37.5%
After finding the difference do you multiply or divide?
Divide.
12 becomes 48
300% increase
100 becomes 20
80% decrease
Milyse sends 800 text messages in an hour. She it was only 200. What is her percent error?
75% error
75 shoes there are actually 95.
21%
After dividing what number do you multiply to get a percentage?
100
1.5 become 3
100% increase
75 becomes 25
67% or 66.7%
There were 150 markers in the pack. Lyra thought it was was only 80. What is her percent error.
47% or 46.7%
5 increases to 95
1800%
In increase and decrease problems how do you know what number to divide by in the second step?
It is the number that is the ORIGINAL value.
19.2 becomes 30.5
59% or 58.9%
1000 becomes 126
87.4%
Ms. Dell-Shearer thought she had 20 pencils. She actually had 6 what is her percent error?
233% or 233.3%
100 decreases to 75.
25% decrease
In percent error questions, do you divide by what they thought the value was or by what the actual value is?
ACTUAL value