Multi-digit multiplication: place value and area models

Using area model and properties to multiply
Multiply 2-digits by 1-digit with area models
Multiply 2-digits by 1-digit with distributive property
Multiplying with area model: 6 x 7981
Multiply 3- and 4-digits by 1-digit with area models
Multiply 3- and 4-digits by 1-digit with distributive property