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Type a number less than 10 into the RED box.

The numbers in the other boxes will change.

Do this a few times until you can see what is happening.

1. When R = 8 what number is B?

B =

2. When B = 68 what number is R?

R =

3. R.

Write down a rule or formula for finding B when you know
4. When R = 100 what number should you get for B?

The computer won't tell you! Use your rule or formula.

The computer won't tell you! Use your rule or formula.

B =

5. R when you know B.

Write down a rule or formula for finding
6. What number should you put in R to get B=252?

The computer won't tell you! Use your rule or formula.

The computer won't tell you! Use your rule or formula.

R =