Here is another great math trick that I recently found and would be great to teach your students or kids. The fun part is that they can choose ANY number at the start and, if they perform the calculations correctly, the answer will always be 8! Give it a go and try it out with a few different numbers to begin with.
Step 1: Come up with any number.
Step 2: Subtract 1 from this number.
Step 3: Multiply your answer with the number 3.
Step 4: Add 12 to the number.
Step 5: Divide the result by 3.
Step 6: Add another 5 to your answer in Step 5.
Step 7: Subtract the first number you came up with at the start (Step 1) from the number you resulted in at the end of Step 6.
The Answer will be Number 8!
A 21st century School Teacher, Mother, and Wife.