1. Understand that the numbers 1119 are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones (C)
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Lesson objective: Understand that the numbers 1119 are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.
Students bring prior knowledge that every number 1 to 9 has a partner such that the two numbers can be composed to make 10 from Grade K, Unit 12, K.OA.A.4. This prior knowledge is extended to include composing the numbers 1119 as students group the ten ones and see the extra ones that form a teen number. A conceptual challenge students may encounter is thinking that the numbers 1119 are each separate units and not a continuation of the counting baseten pattern.
The concept is developed through work with a ten frame and counters, which shows that the numbers 1119 contain ten ones and some extra ones.
This work helps students deepen their understanding of numbers because it will introduce the base ten system and how the numbers 1119 are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.
Students engage in Mathematical Practice 4 model with mathematics as they demonstrate how to count efficiently with an organized system. Students will discover how making a group of ten is a more efficient way to count the numbers 1119 by providing students with a place to group the ten and then have some extras left over. Give the students a ten frame to put the ten in and see the extra. This should lead to students discovering there are 10 ones and some more ones.
Key vocabulary:
 compose
 decompose
 "teen" numbers
Special materials needed:
 cup for each student or pair of students with 1119 counters/jellybeans in it
 ten frame