# Divide Paper into Fifths: Fujimoto Approximation

Interestingly, you can “eye-ball” a 1/5 division and get surprisingly good results if you employ Fujimoto’s Approximation. This method decreases the initial error by a half every time you make a fold. Although it is an approximation, the final result is often good enough to proceed with your origami folding.

#### Divide Paper into Fifths: Fujimoto Approx.

• Start on the left-edge of the paper and make a pinch fold at a location which you estimate to be approximately 1/5th of the length of the paper.
Call this pinch mark “A”.

• Fold the right-corner of the paper so it meets with “A”. Make pinch fold “B”.

• Fold the right-corner of the paper so it meets with “B”.
Make a pinch fold “C”.

• Fold the left-corner of the paper to meet with “C” and make pinch fold “D”.

• Fold the left-corner of the paper to pinch mark “D”. Press down to form crease “E”. Assuming that your initial pinch “A” is not too far off, crease E will be quite close to the true 1/5th division.

• At this point, it is just a matter of folding the right side of the paper in half to get 2/5th segments.

• These are then folded in half to get five 1/5th divisions.

Fujimoto’s approximation works for any divisions and any angle too. The mathematics behind the Fujimoto Approximation is discussed in Tom Hull’s book Project Origami: Activities for Exploring Mathematics. You can also learn more about this approximation here.

•

### Books with Easy Origami

• Easy Origami: over 30 simple projects by John Montroll
• Origami Fun Kit for Beginners by John Montroll
• My First Origami Kit by Joel Stern
• Easy Origami: A Step-by-Step Guide for Kids by C Alexander & M Meinking
• Fun With Easy Origami (Dover Origami Papercraft)
• Origami: A Step-by-Step Introduction to the Art of Paper Folding by T Cook & S Henry
• Easy Origami For Kids Book Traditional Japanese Folding Papers Overs 20 Projects by J Wish
• Easy Origami for Kids: Over 40 Simple Origami Projects by O Brooks

Easy Origami Books

•