Cardinality, Addition & Subtraction Using Early Counting Strategies

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In this activity, students move a collection of counters to a number strip. This supports their understanding of one-to-one correspondence, cardinality, and numeral Identification.

This Jamboard can be used to present both covered and uncovered addition & subtraction tasks. Posted 8/21/20. Updates include dinosaur and bear "counters" to add variety.

This jamboard simulates the Row Task described in Teaching Number: Advancing children's skills & strategies by R. Wright, et al. The bear, berry, circles and the editable number can be used to mark or label individual dots and the blue covers can be used to screen dots.

Each slide deck consists of a series of slides in which students match two quantities or a quantity and a numeral. Quantity images include finger patterns, dot patterns, dominos, beads and frames.

This activity helps children to develop an understanding of the concepts of more and less, focusing on the relationship between the given quantities. In this activity, students compare 2 shape puzzles, and make a prediction of which holds
more or less cubes, and moves a description card beside the corresponding shape. The cubes are included on the slide for counting or justification.

Once the children can determine if one quantity is more or less than another, we need to shift the focus to the actual relationships between the quantities; for example Five is one less than six, and six is one more than five. Children will estimate
how many more or less cubes fit in one puzzle than another.

"Bead chains" are a visual representation of chains with 1 to 10 beads, color coded to match Cuisenaire Rods. (For example, a single bead is white and a row of 10 beads is orange.) Students can manipulate the bead chains to show different ways of building a target number. They then write equations to match their work. Two versions of the activity are provided.