Number sense
Distinguish count, order, and size; split or combine numbers and place them on a number line.
Meaning
Numbers represent counts, positions in an order, or amounts. On a number line, compare positions using a chosen unit interval.
Example
Splitting 7 marbles into groups of 3 and 4 still leaves 7 altogether. On a number line, 7 is one unit to the right of 6. “7 objects” gives a count; “seventh” gives a position. These have different roles.
Practice for this concept
Scope and references
Topics
Counting, cardinal and ordinal numbers, comparing numbers, composing and decomposing numbers, number lines
Learning goal
Distinguish count, order, and size; split or combine numbers and place them on a number line.
Helpful background
Start by comparing the number and order of nearby objects.
Comparing three-digit natural numbers
Does not include counting, ordering, or constructing number lines.