Unit 7 Overview:

In this unit, students work with numbers up to 1,000 to further extend their understanding of place value and the relationship between the values of the different places within a number. Students will then use their place value understanding and properties of operations to add and subtract numbers within 100 fluently. To add and subtract within 1,000, students will use concrete materials like base ten blocks and pictorial representations to model regrouping.

Mental math strategies will be emphasized as students develop addition and subtraction fluency within 20.

Students will also extend their understanding of addition and subtraction problem structures by solving one-step problems with unknowns in all positions ( ? + 23 = 45, 68 - ? = 36, etc.).

A final component of this unit involves working with equal groups of objects to gain a foundation for multiplication. The focus will be to connect multiplication to repeated addition. Students will construct rectangular arrays using concrete manipulatives and use repeated addition to find the number of objects in an array.

1. Students will fluently use all addition and subtraction grade level fact strategies within 20. (2.OA.B.2)
2. Students will use different models to solve real world addition and subtraction story problems involving one step and two step problems within 100. (2.NBT.B.5, 2.OA.A.1)
3. Students will use various models to show, reason, and explain applied strategies based on place value and the properties of operations when adding and subtracting within 100. Note: Possible strategies to use as appropriate for students include: base-ten concrete models, base-ten quick pictures, breaking apart, number lines, compensation, hundreds chart. (2.NBT.B.5, 2.NBT.B.9)
4. Students will use word problems to count money of mixed sets up to a $5 in real life situations. (2.MD.C.8)
5. Students will use counting strategies based on place value and properties of operations to add three 2-digit numbers in real life situations. (2.NBT.B.6)
6. Students will understand addition and subtraction strategies used with two-digit numbers can be applied to three-digit numbers within 1,000 using concrete models and pictures. (2.NBT.B.7)
7. Students will understand that a rectangle can be partitioned into equal rows and columns to create an array using objects and pictures and use a repeated addition equation to express the total. (2.G.A.2, 2.OA.C.4)