## FILL A BOX WITH CHOCOLATE—SKIP COUNTING TECHNIQUES

Grades: 3‒4

Students are informally introduced to a rectangular array model of multiplication in this series of three games. In the first game, students are given empty boxes of varying dimensions to fill with chocolate bars. Students skip count to find the total number of chocolate squares that fill each box. In the remaining games, students are given the total number of chocolate squares and the number of columns or rows in which they are arranged. They must then determine the missing dimension of their box.

OBJECTIVES
• Students will subdivide a rectangular array into strips of size 1, 2, and 5 squares and then skip count to determine the total number of squares in the array.
• Students will interpret the meaning of the terms row and column.

COMMON CORE CONNECTIONS
Mathematical Practices

(1) Make sense of problems and persevere in solving them; (2) Reason abstractly and quantitatively; (3) Construct viable arguments and critique the reasoning of others; (5) Use appropriate tools strategically; (7) Look for and make use of structure.

Content Standards

2.OA4, 3.OA1, 3

This activity is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: http://creativecommons.org/licenses/by-nc-sa/3.0/. If you adapt and/or share this activity, you must attribute it to "KCP Technologies, a McGraw-Hill Education Company." You may distribute it only non-commercially under the same or similar license.

This material is based upon work supported by the National Science Foundation under KCP Technologies Award ID 0918733, with grant period September 1, 2009 through August 31, 2013. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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