Grade 6 Mathematics · Unit 2: Understanding the World Around Us Through StatisticsStandard 6.NOS.3

Lesson 2.112.11 Small Group · Group 2

Group 2 · Set BSecond challenge form · new problems, same idea

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Learning target I can add and subtract decimals by lining up the place values and the decimal points, explain why the method works, and use it on a problem I have not seen before.

Remember2.11 Small Group · Group 2

Lining up the decimal points keeps each place value in its own column, even when one number is a whole number. A whole number has a decimal point at the end. Write zeros after it to subtract decimals.

Words: Decimal (Decimal)Place value (Valor posicional)Tenths (Décimas)Hundredths (Centésimas)Annex zeros (Agregar ceros)

Part 1Understand the ideamodels and meaning
  1. 1Complete each step, then write the final answer.

    A scale reads 3.2 kg. A box that weighs 1.875 kg is taken off. What does the scale read now?

    Show your work
    Final answer:
Part 2Apply itreal-world problems
  1. 2Complete each step, then write the final answer.

    Lia has $15. She buys a book for $8.37. How much money does she have left?

    Show your work
    Final answer:
  2. 3Complete each step, then write the final answer.

    Find 50 − 23.47.

    Show your work
    Final answer:
  3. 4Complete each step, then write the final answer.

    Find 100 − 0.07 − 45.6.

    Show your work
    Final answer:

Explain your thinkingWhen you subtract a decimal from a whole number, why do you write zeros after the decimal point? Use Raj's mistake.

How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help