Mental Math Drills

Video instruction for mental math drills
Addition
  video instructions      
start - Add Level 1 (0 to 5 like 3 + 5)
start - Add Level 2 (1 to 7 like 6 + 7)
start - Add Level 3 (2 to 9 like 4 + 9)
start - Add Level 4 (2 to 19 like 12 + 19)     Special strategy/trick
blocked - Add Level 5 (2 to 99 like 37 + 91)     Special strategy/trick
blocked - Add Level 6 (11 to 999 like 234 + 926)     Special strategy/trick

Multiplication   video instructions   
start - Multiply Level 1 (0 to 5 like 4 x 5)
start - Multiply Level 2 (2 to 7 like 6 x 7)
blocked - Multiply Level 3 (2 to 9 like 8 x 9)
start - Multiply Level 4 (11 to 19 like 13 x 17)   Special strategy/trick and proof
blocked - Multiply Level 5 (like 5 x 83)      Special strategy/trick
blocked - Multiply Level 6 (like 3 x 243)      Special strategy/trick
blocked - Multiply Level 7 (like 35 x 35)    Special strategy/trick and proof

Subtraction
start - Subract Level 1 (1 to 9 like 9 - 4)
start - Subract Level 2 (2 to 19 like 17 - 9)
blocked - Subract Level 3 (2 to 99 like 93 - 47)      Special strategy/trick
blocked - Subract Level 4 (2 to 999 like 745 - 251)       Special strategy/trick

Division
start - Division Level 1 (Example: 42 / 6)
blocked - Division Level 2 (Example: 72 / 8)
blocked - Division Level 3 (Example: 245 / 7)