You may also like

problem icon

Special Numbers

My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?

problem icon

Your Number Is...

Think of a number... follow the machine's instructions. I know what your number is! Can you explain how I know?

problem icon

First Forward Into Logo 6: Variables and Procedures

Learn to write procedures and build them into Logo programs. Learn to use variables.

Your Number Was...

Stage: 3 Challenge Level: Challenge Level:1

Can you write each step of the machine's instructions as a function machine?
What happens if you work backwards?
Think of a number: ? add 3: ?+ 3 double: ?+? +6 add 4: ?+?+10 halve: ?+5 take away the number you started with: 5