

Unit 2 Place Value and Problem Solving using Addition
and Subtraction with Units of Measure Grade 3 Math 

Unit Length and Description: 30 days In Unit 2, students use place value
understanding to round whole numbers. Students add and subtract using
strategies and algorithms. Students
solve one and twostep word problems involving addition and subtraction,
units of measure and telling time. Students continue to practice
fluency of basic facts involving factors of 2, 3, 4, 5, and 10 and their
related division facts. 

Standards:


Enduring Understandings: Place
Value and Rounding… •
Estimation helps us see whether or
not our answers are reasonable. •
Using rounding is an appropriate
estimation strategy for solving problems and estimating. Addition and Subtraction… •
Addition and subtraction are
inverse operations. •
Addition means the joining of two
or more sets that may or may not be the same size. The counting up strategy
can be used to make change. •
Subtraction denotes finding the
difference between sets or comparing sets. Measurement: ·
The duration of an event is called
elapsed time and it can be measured. ·
Mass and volume are important
parts of everyday life and can determined a variety of ways. 
Essential Questions: ·
Does
rounding a number change its value relative to other numbers? ·
How
are addition and subtraction alike and how are they different? ·
How
can I show what I know about addition and subtraction, problem solving, and
estimation? ·
How
can I use what I know about addition and subtraction to help me solve
problems? ·
What
type of situations do we add and subtract? ·
How
can I use what I understand about money to solve word problems? ·
How
do we round numbers to the nearest ten or hundred? ·
How
is rounding used in everyday life? ·
What
strategies can I use to help me tell and write time to the nearest minute and
measure time intervals in minutes? ·
Why
is measurement important in my everyday life? 

