1/2? =0.5=50% 1/3? ≈0.333? =33.3% 2/3? ≈0.667=66.7% 1/4? =0.25=25%

3/4? =0.75=75% 1/5? =0.2=20% 2/5? =0.4=40% 3/5? =0.6=60%

4/5? =0.8=80% 1/6? ≈0. 167= 16.7% 5/6? ≈? 0.833=83.3%? 1/8? =0. 125= 12.5%

3/8? =0.375=37.5%? 5/8? =0.625=62.5%? 7/8? =0.875=87.5%? 1/9? ≈? 0. 1 1 1= 1 1. 1%

1/ 10? =0. 1= 10%? 1/20=0.05=5%? 3/20=0. 15= 15%? 7/20=0.35=35%? 9/20=0.45=45%

1 1/20=0.55=55%? 13/20=0.65? =65%? 17/20=0.85=85%? 19/20=0.95=95%? 1/ 16? =0.0625=6.25%? 1/32? =0.03 125=3. 125%

1/64? =0.0 15625= 1.5625%

Second, the calculation of common pi

3. 14× 1=3. 14? 3. 14×2=6.28? 3. 14×3=9.42? 3. 14×4= 12.56? 3. 14×5= 15.70

3. 14×6= 18.84? 3. 14×7=2 1.98? 3. 14×8=25. 12? 3. 14×9=28.26

3. 14× 10=3 1.40? 3. 14× 1 1=34.54? 3. 14× 12=37.68

3. 14× 16=50.24? 3. 14× 18=56.52? 3. 14×20=62.80

3. 14×25=78.50? 3. 14×32= 100.48? 3. 14×36= 1 13.04

3. 14×49= 153.86? 3. 14×64=200.96? 3. 14×8 1=254.34

3. 14× 12 1=379.94