### Video instructions and help with filling out and completing Which Form 8815 Calculator Instructions and Help about Which Form 8815 Calculator

Hi everyone I'd like to present my latest model which is a simple lego technic calculator it can perform addition subtraction and calculate the average of two numbers on the Left we have two sliders that I can move back and forward and their values are represented by the red liftarms for example I have the number 2 plus the number 4 equals the number 6 the average of 2 and 4 is represented by the yellow lifter in this case it's the value 3 I can lock the number 6 in place and move the sliders and at all times these will add up to the value of 6 so we have 2 plus 4 3 plus 3 4 plus 2 we also have the values in between so we can do 3 point 5 plus 2 point 5 equals the value 6 if I want to do subtraction I can set the value that I want in the middle to say 5 minus 4 equals 1 I can also lock that value in place and I can move them the sliders so we can see all the values so we can say 5 minus 3 equals 2 5 minus 2 equals 3 5 minus 1 equals 4 if you have any questions please leave them in the comments and thank you for watching