**Second Grade**

Dream Box – Build Expressions Equal to Twenty. Using expressions that have one to three addends, this tool engages students in understanding various number pairs that equal up to twenty. Lesson

Dream Box – Build Expressions Equal to One Hundred. Using expressions that have one to three addends, this tool engages students in understanding equivalence of numbers and expressions up to one hundred. Lesson

**Third Grade**

Dream Box – Equivalence up to Twenty. Using two expressions that each have one to three addends, this tool engages students in understanding various number pairs that equal twenty. Lesson

Dream Box – Equivalence up to One Hundred. Using two expressions that each have one to three addends, this tool engages students in understanding equivalence of numbers and expressions up to one hundred. Lesson

Dream Box – Ordering Fractions on the Number Line 0–1. Using fractions from 0 to 1, the fraction number line helps students compare and order fractions from 0 to 1. Lesson

CCSS.MATH.CONTENT.2.NBT.B.5

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

CCSS.MATH.CONTENT.3.NF.A.2.B

Represent a fraction *a*/*b* on a number line diagram by marking off a lengths 1/*b* from 0. Recognize that the resulting interval has size *a*/*b* and that its endpoint locates the number *a*/*b* on the number line.

CCSS.MATH.CONTENT.3.NF.A.3.A

Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line.