Place Value and Problem Solving using Addition and Subtraction with Units of Measure
Unit Length and Description:
In Unit 2, students use place value understanding to round whole numbers. Students add and subtract using strategies and algorithms. Students solve one- and two-step 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.
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.
· 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.
· 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?