Students extend their use and understanding of whole numbers to addition and subtraction of simple decimals. Students solve problems involving addition, subtraction, multiplication and division of whole numbers, including the addition and subtraction of negative numbers, and understand the relationships among the operations. Students know how to factor small whole numbers. Students use and interpret variables, mathematical symbols and properties to write and simplify expressions and sentences. Students know how to manipulate equations.
Students understand perimeter and area.
Use these formulas to find the areas of more complex figures by dividing them into parts with these basic shapes 2. Students use two-dimensional coordinate grids to represent points and graph lines and simple figures. Students demonstrate understanding of plane and solid geometric objects. They use this knowledge to show relationships and solve problems. 3.5 know the definitions of right angle, acute angle and obtuse angle.