Standards/elements assessed at the end of this unit:

M2N1. Students will use multiple representation of numbers to connect symbols to quantities.

a: Represent numbers using a variety of models, diagrams, and number sentences (e.g., 4703 represented as 4,000 +700+3, and units, 47 hundreds +3, or 4,500 +203).

b: Understand the relative magnitudes of numbers using 10 as a unit, 100 as a unit, or 1000 as a unit. Represent 2-digit numbers with drawings of tens and ones and 3-digit numbers with drawings of hundreds, tens, and ones.

M2N2. Students will build fluency with multi-digit addition and subtraction.

a: Correctly add and subtract two whole numbers up to three digits each with regrouping.

b: Understand and use the inverse relation between addition and subtraction to solve problems and check solutions.

d: Use basic properties of addition (commutative, associative, and identity) to simplify problems (e.g. 98 +17 by taking two from 17 and adding it to the 98 to make 100 and replacing the original problem by the sum 100 + 15).

M2N5. Students will represent and interpret quantities and relationships using mathematical expressions including equality and inequality signs (=, >, <, ≠).

b: Represent problem solving situations where addition, subtraction or multiplication may be applied using mathematical expressions.



Additional standards/elements introduced, developed, and/or briefly addressed in this unit:

M2N2.c: Use mental math strategies such as benchmark numbers to solve problems.

M2N2.e: Estimate to determine if solutions are reasonable for addition and subtraction.

M2N5. a: Include the use of boxes or ___ to represent a missing value.