# Single Function Machine Numbers are entered into a function machine 1, 2, 3, 4 …. What is happening to the numbers? 2, 4, 6, 8 … These numbers come out.

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Single Function Machine Numbers are entered into a function machine 1, 2, 3, 4 …. What is happening to the numbers? 2, 4, 6, 8 … These numbers come out

What is happening? Numbers are entered into a function machine 1, 2, 3, 4 … 2, 3, 4, 5 … These numbers come out

What is happening? Numbers are entered into a function machine 10, 20, 30, 40 … 5, 10, 15, 20 … These numbers come out

Using the TI-15 Explorer Locate the op1 key This key operates like a function machine. To simulate a function machine that doubles the numbers press x2. Enter 5 into your calculator press. The display should show 10.

Using the TI-15 Explorer 2 Use the key to create your own function machine questions. Write your questions on the single function machine worksheet. Remember to keep a copy of your questions and answers. Give a copy of your question sheet to a partner to solve.

Reverse Function Machine What happens if the function machine is set in reverse? 1, 2, 3, 4 …. What is happening to the numbers? 2, 4, 6, 8 … These numbers are fed into the machine

Reverse Function Machine 2 What happens if the function machine is set in reverse? 1, 2, 3, 4 …. What is happening to the numbers? 2, 3, 4, 5 … These numbers are fed into the machine

Reverse Function Machine 3 What happens if the function machine is set in reverse? 10, 15, 20, 25 …. What is happening to the numbers? 20, 30, 40, 50 … These numbers are fed into the machine

Linking Forward and Reverse What do you notice happens to the operation when a function machine is set in reverse? Explore your ideas using the key on your TI-15 Explorer calculator

Forward and Reverse + and – are inverse operations If the function machine adds 2, then when it is put in reverse it would subtract 2 X and ÷ inverse operations If the function machine multiplies by 10, then when it is put in reverse it will divide by 10

What Happens When Two Function Machines Are Joined? 1, 2, 3, 4 …. Test it out using the and keys on your TI-15 Explorer calculator + 2 + 3

Addition and Subtraction 1, 2, 3, 4 …. What about subtracting and adding? + 5 – 2

Multiplication 1, 2, 3, 4 …. Could I replace two function machines with one machine? What single machine could replace the two machines? x 2 x 5

Multiplication and Division 1, 2, 3, 4 …. What happens when you join two division function machines? x 10 ÷ 2

Prime Numbers 23456 789101112 131415161718 192021222324 252627282930 313233343536 373839404142 434445464748 495051525354 555657585960 616263646566 676869707172 737475767778 798081828384 858687888990 919293949596 979899100101102 103104105106107108 109110111112113114 115116117118119120

123456 789101112 131415161718 192021222324 252627282930 313233343536 373839404142 434445464748 495051525354 555657585960 616263646566 676869707172 737475767778 798081828384 858687888990 919293949596 979899100101102 103104105106107108 109110111112113114 115116117118119120

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