How to make two erasers as long as crayons?

1. First take out two erasers and a crayon material, and measure the length of the two erasers and the length of the crayon vertically to get the result.

2. Secondly, if the crayon is longer than the eraser, divide the two erasers vertically into four pieces with a knife and put them together vertically, and compare them with the crayon.

3. Finally, cut off the excess rubber to make it equal in length.