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Focus of the Week

During first grade, students will participate in a math program called Story of Units.  The Story of Units consists of 6 modules.  You may click on the link below to view each module.

We are currently working on Topic D of Module 4.

Grade 1 Module 4:  Place Value, Comparison, Addition and Subtraction to 40

Module 4 builds upon Module 2’s work with place value within 20, now focusing on the role of place value in the addition and subtraction of numbers to 40.  Students study, organize, and manipulate numbers within 40.  They compare quantities and begin using the symbols for greater than (>) and less than (<).  Addition and subtraction of tens is another focus of this module as is the use of familiar strategies to add two-digit and single-digit numbers within 40.  Near the end of the module, the focus moves to new ways to represent larger quantities and adding like place value units as students add two-digit numbers.

Overview of Module 4

The module opens with Topic A, where students study, organize, and manipulate numbers within 40. Having worked with creating a ten and some ones in Module 2, students now recognize multiple tens and ones. The topic closes with the identification of 1 more, 1 less, 10 more, and 10 less as students learn to add or subtract like units (1.NBT.5).

In Topic B, students compare quantities and begin using the symbols for greater than (>) and less than (<) (1.NBT.3). Students demonstrate their understanding of place value when they recognize that 18 is less than 21 since 2 tens already have a greater value than 1 ten 8 ones. To support understanding, the first lesson in the topic focuses on identifying the greater or lesser amount. With this understanding, students label each of the quantities being compared and compare from left to right. Finally, students are introduced to the mathematical symbols using the story of the alligator whose hungry mouth always opens toward the greater number. The abstract symbols are introduced after the conceptual foundation has been laid.

Topic C focuses on addition and subtraction of tens (1.NBT.4, 1.NBT.6). Having used concrete models in Topic A to represent 10 more and 10 less, students now recognize that just as 3 + 1 = 4, 3 tens + 1 ten = 4 tens. With this understanding, students add and subtract a multiple of 10 from another multiple of 10. The topic closes with the addition of multiples of 10 to numbers less than 40 (e.g., 12 + 30).

In Topic D, students use familiar strategies to add two-digit and single-digit numbers within 40. Students apply the Level 2 strategy of counting on and use the Level 3 strategy of making ten, this time making the next ten (1.NBT.4). For instance, when adding 28 + 5, students break 5 into 2 and 3 so that 28 and 2 can make the next ten, which is 30, or 3 tens, and then add 3 to make 33. The topic closes with students sharing and critiquing peer strategies. In Topic E, students consider new ways to represent larger quantities when approaching put together/take apart with total or addend unknown and add to with result or change unknown word problems. Students begin labeling drawings with numerals and eventually move to tape diagrams to represent the problems pictorially (1.OA.1). Throughout this topic, students continue developing their skills with adding single-digit and double-digit numbers (introduced in Topic D) during fluency activities.

Grade 1 Module 3: Ordering and Comparing Length Measurements as Numbers

Module 3 begins by extending students’ kindergarten experiences with direct length comparison to indirect comparison whereby the length of one object is used to compare the lengths of two other objects.  Longer than and shorter than are taken to a new level of precision by introducing the idea of a length unit.  Students then explore the usefulness of measuring with similar units. The module closes with students representing and interpreting data.

Overview of Module 3:

Grade 1 Module 3 opens in Topic A by extending students’ Kindergarten experiences with direct length comparison to the new learning of indirect comparison whereby the length of one object is used to compare the lengths of two other objects (1.MD.1).

Topic B takes longer than and shorter than to a new level of precision by introducing the idea of a length unit. Centimeter cubes are laid alongside the length of an object as students learn that the total number of cubes laid end to end with no gaps or overlaps represents the length of that object (1.MD.2).

Topic C explores the usefulness of measuring with similar units. Students measure the same objects from Topic B using two different non-standard units, toothpicks and small paper clips, simultaneously to measure one object and answer the question, “Why do we measure with same-sized length units?” (1.MD.2).

Topic D closes the module as students represent and interpret data (1.MD.4). They collect data about their classmates and sort that information into three categories. Using same-sized pictures on squares, students represent this sorted data so that it can be easily compared and described. Students interpret information presented in the graphs by first determining the number of data points in a given category.

# Grade 1 Module 2:  Introduction to Place Value Through Addition and Subtraction Within 20

Module 2 serves as a bridge from students' prior work with problem solving within 10 to work within 100 as students begin to solve addition and subtraction problems involving teen numbers. Students go beyond the Level 2 strategies of counting on and counting back as they learn Level 3 strategies informally called "make ten" or "take from ten."

Overview of Module 2:

Topic A begins with students solving word problems with three addends (1.OA.2) as a way for them to begin to explore the make ten Level 3 strategy in a meaningful context.

Topic B focuses on the take from ten Level 3 strategy (1.OA.6). Students begin with word problems calling on them to subtract 9 from 10 in Lessons 12 and 13, first with concrete objects, then with drawings, and then with number bonds.

Topic C provides students with practice solving add to with change unknown, take from with change unknown, put together with addend unknown, and take apart with addend unknown word problems (1.OA.1)

Topic D closes the module with students renaming ten as a unit: a ten.

We will continue the 1st grade Module 1 Story of Units.  This unit focuses on fluency (speed with accuracy) with additon and subtraction of numbers to 10.  We will use addition and subtraction to solve word problems.  Students will use number bonds to help them build this fluency.

We will continue to explore and understand number bonds up to 10.

We will continue our Story of Units module on number bonds and strategies to build our fluency with addition to 20.

Module 1

We will review math skills taught in kindergarten.  This will include understanding subitizing, five and ten groups, and number bonds.