Writing Expressions with Visual Models

This lesson teaches how to write expressions to represent numerical situations using visual models. It explains the components of expressions and provides examples, such as doubling a number and adding another, multiplying sums, and using parentheses to ensure correct order of operations. The lesson emphasizes the difference between expressions and calculations, highlighting the importance of order and structure in expressions.

What is an expression in mathematical terms?

How do you represent the calculation 'double 5, then add 12' as an expression?

Explain why parentheses are necessary in the expression for 'multiply the sum of 5 and 1 by 2'.

What is the difference between the order of numbers in an expression and the order of numbers in a calculation?

Describe the steps to write the expression for 'subtract 3 from 11, then divide by 4'.