Transcript Justify a Number Trick

JUSTIFY A NUMBER TRICK
Goal: The learner will be able to explain how
a number trick works and create their own.
A Quick Trick
1. Pick a number.
2. Double it.
3. Add 10.
4. Divide by two.
5. Subtract the original number.
6. Did you get 5?
Why did it work?
1. Pick a number.
2. Double it.
3. Add 10.
4. Divide by two.
5. Subtract the original number.
6. Did you get 5?
Due: Friday, 23, September
• Go to page 104 in your text.
• Play the number trick in the Explore.
• Try it with three different numbers and record your result.
• Complete #1-4 in the Draw Conclusions.
• Write out your responses neatly and in complete
sentences where necessary.
• For Exercise 4 you will have another student test your
number trick and sign their name to it.
• You will be graded on Criterion B: Recognizing Patterns.
Questions to ask yourself before you turn
it in.
Exercise 1and 2
Did you follow Order of Operations correctly?
Did you explain every step in the number trick?
Exercise 3
Did you completely describe what is happening?
Did you justify your answer?
Were you able to change the trick to always answer 15?
Did you explain how you changed the answer to 15 and explain
why it works?
Exercise 4
Does your number trick work?
Did someone else test it?