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

Lesson 2.112.11 · Part II

Start hereWords, worked example, and sentence starters

Name Date Period

Learning target I can add and subtract decimals by lining up the place values and the decimal points.

Start hereWords for this lesson

Read each word before you begin. Say it out loud.

WordWhat it meansExample
DecimalSpanish: Decimal A number with a dot, like 0.5, that shows a part less than one. 3.75 means 3 ones + 7 tenths + 5 hundredths — it is between 3 and 4
Place valueSpanish: Valor posicional What a digit is worth based on where it sits in a number. In 4.38: the 4 = 4 ones, the 3 = 3 tenths (0.3), the 8 = 8 hundredths (0.08)
TenthsSpanish: Décimas The first spot after the decimal point. It shows parts out of 10. 0.7 = 7/10 — like 7 slices of a pizza cut into 10 equal slices
HundredthsSpanish: Centésimas The second spot after the decimal point. It shows parts out of 100. 0.05 = 5/100 — like 5 pennies out of a dollar (100 pennies)
Annex zerosSpanish: Agregar ceros Adding zeros at the end of a decimal so numbers line up evenly. 15.7 becomes 15.70 so you can subtract 15.70 − 8.36 with aligned place values

Say it and write itSentence starters

Finish each sentence out loud with a partner. Then use them in your writing.

Word bank DecimalPlace valueTenthsHundredthsAnnex zeros

Watch out!A common mistake

A common mistake in Add and Subtract Decimals is lining up the last digits (the right edges) of each number instead of lining up the decimal points

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

Lesson 2.112.11 · Part II

Apply Day · Version ASupported practice

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
Name Date Period

Learning target I can add and subtract decimals by lining up the place values and the decimal points.

Part 1Practice the skillshow every step
  1. 1Complete each step, then write the final answer.

    Find 3.2 + 4.65.

    Show your work

    Hint Write 3.2 as 3.20. Line up the decimal points. Then add.

    Final answer:
  2. 2Complete each step, then write the final answer.

    Find 14.6 + 3.25.

    Show your work

    Hint Write 14.6 as 14.60. Line up the decimal points. Then add.

    Final answer:
Part 2Apply itreal-world problems
  1. 3Complete each step, then write the final answer.

    Find 8.75 − 2.4.

    Show your work

    Hint Write 2.4 as 2.40. Line up the decimal points. Then subtract.

    Final answer:
3-Point Exit Checklist: ☐ 1. Units & Labels Verified ☐ 2. Mathematical Reasoning Stated ☐ 3. Calculations Double-Checked
How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help
Grade 6 Mathematics · Unit 2: Understanding the World Around Us Through StatisticsStandard 6.NOS.3

Lesson 2.112.11 · Part II

Apply Day · Version BCore practice

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
Name Date Period

Learning target I can add and subtract decimals by lining up the place values and the decimal points.

Part 1Practice the skillshow every step
  1. 1Complete each step, then write the final answer.

    Find 0.6 + 0.47.

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

    Find 36.7 + 8.56.

    Show your work
    Final answer:
Part 2Apply itreal-world problems
  1. 3Complete each step, then write the final answer.

    Eva adds 3.4 + 1.25. She lines up the last digits and gets 1.59. What is the correct sum?

    Show your work
    Final answer:
3-Point Exit Checklist: ☐ 1. Units & Labels Verified ☐ 2. Mathematical Reasoning Stated ☐ 3. Calculations Double-Checked
How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help
Grade 6 Mathematics · Unit 2: Understanding the World Around Us Through StatisticsStandard 6.NOS.3

Lesson 2.112.11 · Part II

Apply Day · ChallengeExtension

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
Name Date Period

Learning target I can add and subtract decimals by lining up the place values and the decimal points.

Part 1Practice the skillshow every step
  1. 1Circle the letter of the best answer. Show how you know.

    Find 12.4 + 3.75.

    1. A4.99
    2. B15.15
    3. C16.15
    4. D16.79
    Line up the place values
Part 2Apply itreal-world problems
  1. 2Complete each step, then write the final answer.

    Raj says 6 − 2.35 is 4.35. He subtracted the ones and copied the .35. What is the correct difference?

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

    Find 50 − 23.47.

    Show your work
    Final answer:
3-Point Exit Checklist: ☐ 1. Units & Labels Verified ☐ 2. Mathematical Reasoning Stated ☐ 3. Calculations Double-Checked
How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help