π\piπ
make a ration for 2000, 2000, 1000
total 5000 space
Box\sqrt{Box}Box 9
□\sqrt{\Box}□ 16
10*16
4+4
5/21 of 45/3 + (- 1/15) ÷3÷7
3'3'3'3'3'3 =
5/21 of 45/3 + (- 1/15) / 3 / 7
7/10 times by 300
