Chapter 8

Adding & Subtracting Decimals

4th Grade: Chapter 8 Outline

Week 18 - Week 19

Essential Questions:

  • How can I add and subtract decimals by using the same algorithms as whole numbers?

Content:

Students will know and understand:

    • Tenth
    • Decimal Form
    • Decimal Point
    • Hundredth
    • Place Holder Zero

Skills:

Students Will:

    • Add decimal up to two decimal places.
    • Subtract decimals up to two decimal places.
    • Solve real-world problems involving addition and subtraction of decimals.

Upon completion of Unit 8:

  • 4.OA.A.3. Solve multistep word problems posed with whole numbers and having whole-number answers using the four operations, including problems in which remainders must be interpreted. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.
  • 4.NBT.A.1. Recognize that in a multi-digit whole number, a digit in one place represents ten times what it represents in the place to its right.
  • 4.NBT.A.2. Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form. Compare two multi-digit numbers based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons.
  • 4.NBT.B.4. Fluently add and subtract multi-digit whole numbers using the standard algorithm.
  • 4.NF.C.5. Express a fraction with denominator 10 as an equivalent fraction with denominator 100, and use this technique to add two fractions with respective denominators 10 and 100.
  • 4.MD.A.1. 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.
  • 4.MD.A.2. 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.
  • MP.1. Make sense of problems and persevere in solving them.
  • MP.2. Reason abstractly and quantitatively.
  • MP.3. Construct viable arguments and critique the reasoning of others.
  • MP.4. Model with mathematics.
  • MP.5. Use appropriate tools strategically.
  • MP.6. Attend to precision.
  • MP.7. Look for and make use of structure.
  • MP.8. Look for and express regularity in repeated reasoning.