Overall Percentage Change
The below QuickQuestion Interface © generates random questions on finding the overall percentage change when two changes are performed one after the other.
Decide which type of percentages you want to work with (Non-Calculator are 1%, 5%, 10%, 20%, 25%, 50%, 75%).
The Type decides whether both changes will be increases, both decreases, a mixture of them, or choose Random to get a random choice each time.
Finally, you can make it a little less abstract by including a value in the question.
When typing answers, use + or - to indicate an increase or a decrease respectively and give numbers to 3 decimal places. Also, remember to include the % symbol. For example, to input a 25.6% increase you would type "+26.5%".
There is a 10QQI version of this activity.
Decide which type of percentages you want to work with (Non-Calculator are 1%, 5%, 10%, 20%, 25%, 50%, 75%).
The Type decides whether both changes will be increases, both decreases, a mixture of them, or choose Random to get a random choice each time.
Finally, you can make it a little less abstract by including a value in the question.
When typing answers, use + or - to indicate an increase or a decrease respectively and give numbers to 3 decimal places. Also, remember to include the % symbol. For example, to input a 25.6% increase you would type "+26.5%".
There is a 10QQI version of this activity.
Ideas for Teachers
The QQI activities are a great way to get all students working. Put random questions on the board, and then get students to answer them on mini-whiteboards. Once all students have answered, and held up their solutions (with working), reveal the answer to see if they were right. Discuss any misconceptions from the working they have shown, or if they have all got it correct, move on to another question (changing the options to make if more difficult if necessary).
The QQI activities are a great way to get all students working. Put random questions on the board, and then get students to answer them on mini-whiteboards. Once all students have answered, and held up their solutions (with working), reveal the answer to see if they were right. Discuss any misconceptions from the working they have shown, or if they have all got it correct, move on to another question (changing the options to make if more difficult if necessary).
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