Everyday Math Double Digit Addition, Subtraction Exchange Routines in everyday math. Whats my rule? routine. | Reasons for Seasons A very helpful video for harder addition facts. The -9 and -8 shortcuts. The second video is about 3D shapes. |
Everyday Math Double Digit Addition, Subtraction Exchange Routines in everyday math. Whats my rule? routine. | Reasons for Seasons A very helpful video for harder addition facts. The -9 and -8 shortcuts. The second video is about 3D shapes. |