UNIT 2:
Addition and Subtraction

Houghton Mifflin Parent Letter

Adding and subtracting numbers is a skill that every child must master in order to be successful in life. We are constantly expected to add and subtract numbers in our daily life, whether we are paying bills or counting change. In this unit, students will use their knowledge of place value to add and subtract larger numbers. They will also estimate sums and differences in order to determine if an answer is reasonable. It is extremely important that students have mastered their basic addition and subtraction facts in order to solve harder problems. 

Extra Help Tutorial Videos

Chapter 4 Lesson 4.1: Addition Properties Lesson 4.2: Estimate Sums Lesson 4.3: Regroup Ones Lesson 4.4: Regroup Ones and Tens Lesson 4.5: Guess and Check Lesson 4.6: Column Addition Lesson 4.7: Add Greater Numbers Lesson 4.9: Estimate or Exact Answer

Chapter 5 Lesson 5.1: Subtraction Rules Lesson 5.2: Relate Addition and Subtraction Lesson 5.3: Estimate Differences Lesson 5.4: Regroup Tens Lesson 5.5: Regroup Tens and Hundreds Lesson 5.6: Subtract Greater Numbers Lesson 5.7: Subtract Across Zeros Lesson 5.8: Explain Your Answer

Extra Help Worksheets
Addition Math Drills Website Super Teacher Website Practice Page A Practice Page B Practice Page C	Subtraction Math Drills Website Super Teacher Website Practice Page A Practice Page B Practice Page C

Back to the Math Page