During Unit 8, your child will solve real world problems that require him to use his knowledge of measurement units and conversions.  Problems may have multiple steps and require the use of one or more of the four operations. In addition to problems involving whole numbers, problems may involve the use of simple fractions and decimal numbers.  Your child may use a diagram, number line, or equation to model the solution to a problem.  He will also need to understand the concepts of perimeter and area and apply the formulas to real world and mathematical problem situations.  Your child will also focus on problem solving in order to demonstrate fluency with addition and subtraction to 1000 and demonstrate fluency for multiplication and division within 100. He will solve problems involving measurement and estimation of liquid volumes, and masses of objects.

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Key Vocabulary

Students need to:

  • Know relative sizes of measurement units within one system of units including km, m, cm, kg, g, lb, oz, l, mL, hr, min, sec.  Within a single system of measurement, express measurements in a larger unit in terms of a smaller unit.  Record measurement equivalents in a two-column table.  For example, know that 1 ft.  is 12 times as long as 1 in.  Express the length of a 4 ft. snake as 48 in. Generate a conversion table for feet and inches listing the number pairs (1, 12), (2, 24), (3, 36), ...
  • Use the four operations to solve word problems involving distances, intervals of time, liquid volumes, masses of objects, and money, including problems involving simple fractions or decimals, and problems that require expressing measurements given in a larger unit in terms of a smaller unit. Represent measurement quantities using diagrams such as number line diagrams that feature a measurement scale.
  • Apply the area and perimeter formulas for rectangles in real-world and mathematical problems.  For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formula as a multiplication equation with an unknown factor.