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1st Grade Math
9. 1.NBT.A.1
9.5 Ordinal numbers
Ordinal Numbers
Discover how ordinal numbers like first, second, and third tell us the position of something in a line, list, or sequence.
What You'll Learn
Distinguish ordinal numbers, which show position such as first or fifth, from cardinal numbers, which show amount.
Recognize the abbreviations 1st, 2nd, 3rd, 4th, and so on as short forms of ordinal words.
Apply the spelling pattern for turning a number into its ordinal word, like turning 7 into seventh.
Identify the position of an object in a line, list, race, or number grid using ordinal language.
Connect ordinal position to counting skills used in number sequences and number grids.
What You'll Practice
1
Identifying objects in ordinal positions up to 10th
2
Finding items in ordinal positions up to 20th
3
Using ordinal language to describe position in a sequence
Why This Matters
Ordinal numbers help you describe order and position in everyday situations like standing in line, following directions, or organizing information. This foundational skill supports your understanding of sequences, patterns, and measurements throughout mathematics.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Ordinal Numbers
Number Sense
Sequencing
Position
Counting
OH Curriculum Aligned