In This Unit of Study…

Students use concrete models to form bundles of 100s with and without leftovers. Students then use concrete and pictorial representations to investigate how three-digit numbers can be composed and decomposed in different combinations within the hundreds, tens and ones place values. Students use a place value mat along with the models to represent the quantities with corresponding written numerals, and they interpret the place value of each digit’s position within a written numeral. Students read and write numbers to 1,000 in standard, expanded, and word form. Students apply what they know about the sums of doubles (to 20) to represent even (by using two equal groups/addends) and odd numbers (by using two equal groups/addends with one left over).

B.E.S.T. Benchmarks:

• MA.2.NSO.2.1 Recall addition facts with sums to 20 and related subtraction facts with automaticity.
• MA.2.NSO.1.1 Read and write numbers from 0 to 1,000 using standard form, expanded form and word form.
• MA.2.NSO.1.2 Compose and decompose three-digit numbers in multiple ways using hundreds, tens, and ones. Demonstrate each composition or decomposition with objects, drawings, and expressions or equations.

Overarching Key Concepts:

• Fluency: Solve subtraction facts using ‘Near Doubles’ to build fluency to 20
• Represent the value of numbers up to 1,000, including equivalent representations