Multiplication
All Nine Sqr
Dbl Trip Quad
Rest

2-4 4-6 6-8
2-9 to12

Division
/ 2 / 3 / 4
/ 5 / 6 / 7
/ 8 / 9 / 10
/ 11 / 12 / 13
/ 14 / 15 / 16
/ 17 / 18 / 19
/ <10 /<20

Addition
<10 <50
Any

Subtraction
<10 <50
Any