Math - 2018-19

2.3 - Ordinal positions

The student will

a)  count and identify the ordinal positions first through twentieth, using an ordered set of objects; and

b)  write the ordinal numbers 1st through 20th.



Adopted: 2016

BIG IDEAS

  • Knowing ordinal numbers is essential to spatial (lining up), temporal (second hour of the day) and personal (I came first)

  • So that I can use ordinal numbers  everyday when we do things like lining up and waiting in line,  finishing a race, or figuring out what grade someone is in


UNDERSTANDING THE STANDARD

  • The cardinal and ordinal understanding of numbers is necessary to quantify, measure, and identify the order of objects.
  • The ordinal meaning of numbers is developed by identifying and verbalizing the place or position of objects in a set or sequence (e.g., a student’s position in line when students are lined up alphabetically by first name).
  • The ordinal position is determined by where one starts in an ordered set of objects or sequence of objects (e.g., from the left, right, top, bottom).
  • Ordinal position can also be emphasized through sequencing events (e.g., days in a month or events in a story).
  • Practical applications of ordinal numbers can be experienced through calendar and patterning activities.


ESSENTIALS

The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to

  • Count an ordered set of objects, using the ordinal number words first through twentieth. (a)
  • Identify the ordinal positions first through twentieth, using an ordered set of objects presented in lines or rows from
    • left to right;
    • right to left;
    • top to bottom; and
    • bottom to top. (a)
  • Write 1st, 2nd, 3rd, through 20th in numerals. (b)

KEY VOCABULARY

Updated: Aug 22, 2018