2.OA.C: Work with equal groups of objects to gain foundations for multiplication.
Second grade students need to be able to determine whether a group of objects (up to 20) is odd or even by using pairing strategies. If the group is an even number of items, students should be able to represent the number of items as an equation. For example, if there are 18 items, students should recognize that 18=9+9. When seeing items in a rectangular array, students should recognize that there are multiple groups of the same number of items. For example, 5 rows of 4 dots would be represented as 4+4+4+4+4=20. This helps build foundations for multiplication! Click on the links below to practice working with groups of objects and beginning multiplication.
This is a great demonstration of how to use arrays to demonstrate multiplication facts. These are arrays for the number 24. Depending on the number of columns and rows, these arrays show many different ways to represent the same number.
For Students!
Click here to access lots of virtual manipulatives and and games to help you work with arrays! Click on "topic 19" to find lots of games that work on arrays and beginning multiplication! Any one of these games will build you knowledge of beginning multiplication.
For Teachers!
Click here to access the Georgia Department of Public Education's Performance Standard Framework for second grade mathematics. This site provides an excellent vocabulary list and logically sequenced curriculum for teaching rectangular arrays, an introduction to multiplication.