In this unit, students focus on the numbers 11 – 19 and the understanding they consist of a unit of 10 and some more ones. They will extend learning from the Kindergarten standard that required them to recognize the numbers 11 – 19 are made of ten ones and then 1, 2, 3, 4, 5, 6, 7, 8, or 9 more ones. The distinction between the kindergarten standard and the first grade standard is students are expected to unitize the ten ones (K) into a single unit of 1 ten (1st). The idea of making a ten is emphasized to facilitate adding and subtracting within 20. Students are likely to struggle with the idea the digits have a place value versus their face value.
Unitataglance
Key concept: A ten is a bundle of ten ones. 
Key concept: The numbers 11  19 are made of a ten and 1, 2, 3, 4, 5, 6, 7, 8, or 9. 
Key concept: We can count on or make ten to add and subtract within 20. 


Suggested pacing 
Days 13 
Days 46 
Days 714 
Suggested class plan 



Additional unit information
Prior Knowledge Needed:
 Read and write numbers to 20. (K.CC.1)
 Find the sum of single digit numbers to 10. (K.OA.4)
 Count on to 100 from a number other than 1. (K.CC.2)
 Add and subtract within 10. (K.OA.2)
Units on the Horizon:
 Developing addition and subtraction strategies (Grade 1, Unit 6)
 Extending strategies for solving addition and subtraction problems (Grade 1, Unit 9).
 Demonstrating proficiency in addition and subtraction situations. (Grade 1, Unit 18)
Lessons & assessment