NAME ______________________________ DATE _______________

Investigation 1

FAMILY LETTER

(PAGE 1 OF 2)

About the Mathematics in This Unit

Dear Family,

Our class is starting a new unit in mathematics called Ten Frames and Teen Numbers. The focus of this unit is on understanding and solving addition and subtraction problems in a variety of contexts (i.e., games, activities, story problems), recording and representing solutions on paper, making sense of the teen numbers (10–19) as a group of ten ones and some number of leftovers, and counting by 1s and 10s to 100.

Students solve story problems and discuss and compare their solution strategies with classmates. They practice counting by 10s as they count the number of fingers on 10 students. They play games where the cards that indicate how far to move (or how many to take) have “facts” on them, so that students develop fluency adding and subtracting within 5 (e.g., 3 + 2 and 4 − 1). They also work on a variety of activities that involve number combinations focusing specifically on combinations that make ten and on the teen numbers.

Throughout this unit, students will be working toward these goals:

Benchmarks/Goals	Examples
Represent and solve subtraction story problems within 10.	There are 6 birds in a tree. Two birds flew away. How many birds are left in the tree?
Count by 1s up to 100, starting from any number. Count by 10s to 100.	d “85, 86, 87, …, 100!” d “10, 20, 30, 40, …, 100!”

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