area model of multiplication- a model in which two numbers being multiplied are represented by the dimensions of a rectangle, and their product is represented by the area of the rectangle
estimate- a close guess of the actual value, usually based on some thought or rough calculation; to make an approximate or rough count, measurement, or calculation
ratio table- a model that represents equivalent ratios; can be used as a tool to solve problems that involve multiplication, division, fractions, and proportions