Unit 2 Computing with Whole Numbers and Decimals

In Unit 2 students will:

  • Add, subtract, multiply and divide decimals to the hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
  • Convert among different-sized standard measurement units within a given measurement system (e.g., convert 5 cm to 0.05 m), and use these conversions in solving multi-step, real world problems
  •  Fluently multiply multi-digit whole numbers using the standard algorithm
  • Find whole-number quotients of whole numbers with up to four-digit dividends and two-digit divisors, using strategies based on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.

By the end of this unit your child will be able to answer the following questions:

  •   What strategies could you use to solve a multi-digit computation problem?
  •   How are the four basic operations related to one another?
  •   How do number properties assist in computation?
  •   How do I take apart and/or recombine numbers in a variety of ways for finding sums, differences, products,  and  quotients?
  •  How are the units of measure within a standard system related?

The following videos support the topics covered in Unit 2.

  • Area Model of Multiplication( Two Digit By Two Digit)

  • Multiplying Decimals by Whole Numbers 

  • Multiplying Decimal by Decimal using the Area Model

  • Expanded Notation for Division

  • Dividing with Expanded Notation

  • Using Base 10 Blocks to Model Long Division

  • Area Model for Division