home

=Arrays, Factor Trees, and Number Puzzles=


 * This page includes activities, worksheets, games, and other ideas to use in the classroom when teaching arrays, number puzzles, and factoring.**


 * Grade Level:** Fourth


 * Common Core Standards Used:**

4.OA.2. Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.1 (Students will connect this standard by using arrays to represent a product of an equation as well as differentiate between multiplication and addition. The focus here is not so much on the arrays themselves but on the use of them to master the concept).

4.OA.3. Solve multistep word problems posed with whole numbers and having whole-number answers using the four operations, including problems in which remainders must be interpreted. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.

4.OA.4. Find all factor pairs for a whole number in the range 1–100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1–100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1–100 is prime or composite.


 * Materials:** Worksheets, smart board, projector, student computers, cubes, graph paper