Making mistakes helps us learn! Your students will flex their analytical muscles to pinpoint errors in multiplication problems using arrays. Use the lesson on its own or as support to Base Ten Arrays for Multi-Digit Multiplication.
Students will be able to use an array to solve multiplication problems with two two-digit factors.
Students will be able to analyze and correct a flawed multiplication problem using arrays and visual representations.
Draw a simple array using dots or circles (e.g., 3 rows of 4 circles) on a piece of chart paper. Note: do not write any numbers or symbols near the array.
Ask students to describe to a partner what they see. Invite a few students to share their observations. Record students' responses below the drawing of the array. Students may say they see an array or some circles in rows and columns. Affirm their responses.
Explain that the circles drawn in neat rows and columns are called an array. Write the word, along with its definition (an arrangement of objects, pictures, or numbers in columns and rows) on the chart paper. Tell students that in this case, this array was drawn to represent a multiplication problem 3 x 4 by showing that when there are 3 rows of 4 circles, there is a total of 12 circles.
Inform students that today they will play the role of multiplication experts and master the art of using arrays to represent and solve multiplication problems.