Thanks Geno...and sorry, you might get it but to others it might look like scrambled numbers.
I will first divide 12 by 2. It will come in handy later!
12/2=6
Now we must divide the board length by 2
84/2=42
This is where the first part comes in handy. We must now add and subtract 6 to 42
42+6=48
42-6=36
Just to check our work, lets add and subtract the two numbers 48 and 36. Adding will show the board length. If it is 84, it will be accurate.
48+36=84
Correct board length
Subtracting is the difference of the lengths
48-36=12
Correct
So I am correct
The lengths of the pieces will be 48 cm and 36 cm