ORC Resource Types

Discipline: Mathematics

Professional Commentary: Students model comparison subtraction on the number line by counting the difference betweeen two positions either forward or backward. They relate the number line model to connecting cube trains....

Discipline: Mathematics

Professional Commentary: This lesson includes three different activities using a pan balance and connecting cubes to model subtraction. Students may also enjoy the pan balance applet linked to the site....

Discipline: Mathematics

Professional Commentary: The opening activities in this lesson are a review of the unit and will be meaningful only for classes who have completed the other 6 lessons in the unit. However, the 5 small-group activities will be enjoyable for any class studying subtraction, especially as used in comparisons....

Discipline: Mathematics

Professional Commentary: Students represent the dots on a domino by hops on the number line. Looking at the dots on both halves of the domino, they predict where they will end up on the number line and then count to see if they are correct....

Discipline: Mathematics

Professional Commentary: Students use a pan balance or a balance beam to explore addition combinations. They may also use the interactive balance applet for further exploration....

Discipline: Mathematics

Professional Commentary: Students engage in two activities using dominoes to reinforce the "doubles" addition combinations. The lesson includes a list of children's counting stories, recording sheets, discussion questions, suggestions for assessment, an extension of the lesson, and questions for teacher reflection....

Discipline: Mathematics

Professional Commentary: Students find different dominoes that have the same total number of spots. They write fact families for each of the different dominoes....

Discipline: Mathematics

Professional Commentary: Students play a game of concentration with dominoes to find all the ways 5, 6, 7, and 8 can be decomposed into sums. They use an online calculator and hundred board to reinforce the decompositions....

Discipline: Mathematics

Professional Commentary: Students solve subtraction problems by hopping on the number line. They also model the problems with counters or links and write the associated subtraction sentences....

Discipline: Mathematics

Professional Commentary: Students listen to the counting story Quack and Count and model subtraction problems in the story using links of two different colors. They write the associated fact families....