Number Machine.

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Presentation transcript:

Number Machine

How does the number trick work? Your chosen number  n Add 3  n + 3 Double  2n + 6 Add 4  2n + 10 Halve  n + 5 Take away n  5

My trick Choose a number. Multiply by 2. Add 10. Divide by 2. Subtract the number you started with. 1 Try again? 8 9 10 4 5 14 7 3 2 11 6 15 12 13

Choose a number. Multiply by 2. Add 26. Divide by 2. Subtract the number you started with. 1 8 9 10 4 5 14 7 3 2 11 6 15 12 13

How? your number: 𝑥 multiply by 2: 2𝑥 add 10: 2𝑥 + 10 divide by 2: 𝑥 + 5 subtract 𝑥: 5 Same with 26 and 13