The video “A Middle-School Math Trick You’ll ACTUALLY USE” is by Inspire Woodcraft. In this engaging tutorial, Jodee demonstrates the practical application of the 3-4-5 rule for ensuring edges are perfectly square, whether you’re working on large projects or small tasks in your workshop.
Understanding the 3-4-5 Rule
Jodee begins by presenting a sheet of MDF, emphasizing the need to check the edges for a perfect 90 degrees. Typically, this would involve using a square, but when the square isn’t large enough, the 3-4-5 rule comes into play.
The concept is simple: if you measure three inches up and four inches over, the distance between those two points should be five inches. This mathematical trick works for any project, big or small.
Scaling the 3-4-5 Rule
However, Jodee points out that checking just a small section isn’t sufficient. To apply the 3-4-5 rule effectively across larger materials, scaling is necessary. With an overall width of 24 inches, Jodee divides this by three, determining the multiplier is eight. This means:
- The three side becomes 3 x 8 = 24 inches.
- The four side becomes 4 x 8 = 32 inches.
Jodee then draws a line for the four side, extending it to the edge of the MDF, ensuring that the measurements are accurate.
Measuring the Five Side
Next, the five side is calculated. Five times the multiplier of eight equals 40 inches. Jodee comfortably uses a tape measure to check this measurement, hooking it to the corner of the material. It’s crucial to get it as close to 40 as possible.
Adjusting for Exact Measurements
But what if the measurement isn’t exact? Jodee illustrates this by explaining that if the measurement reads 40 and a half inches, the tape measure will be hooked higher, indicating that the corner is out of square. Conversely, if the measurement is shorter, that corner is closer, revealing an angle misalignment.
Versatility of the 3-4-5 Trick
Ultimately, Jodee reassures viewers that the 3-4-5 trick is versatile and can be applied to any project, whether it’s in the yard, a field, constructing a house, or tackling a small project in the workshop. This simple mathematical rule is a valuable tool for ensuring precision in any woodworking endeavor.
Inspire Woodcraft hopes this tip helps fellow DIYers and looks forward to sharing more insightful content in future videos!