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

Lesson 2.122.12 Small Group · Group 1

Group 1 · Set BSecond form · new problems, same idea

Mastery check☐ Exceeds☐ Meets target☐ Needs practice

Name Date Period

Learning target With my small group, I can multiply decimals and place the decimal point correctly in the product — one step at a time, with support.

Remember2.12 Small Group · Group 1

Multiply as if the numbers were whole. Then give the product as many decimal places as both factors have together. Multiply decimals like whole numbers. Then count the decimal places to put the point back.

Words: Product (Producto)Decimal point (Punto decimal)Estimate (Estimar)Place value (Valor posicional)Decimal places (Cifras decimales)

Part 1Practice the skillshow every step

1Complete each step, then write the final answer.

Find 1.2 × 3.4.
Show your work
Hint 12 × 34 = 408. Each factor has 1 decimal place, so the product has 2.
Final answer:
2Complete each step, then write the final answer.

Find 0.7 × 0.9.
Show your work
Hint Multiply 7 × 9. The factors have 2 decimal places in all.
Final answer:
3Complete each step, then write the final answer.

Find 0.25 × 0.04.
Show your work
Hint 25 × 4 = 100. The factors have 4 decimal places in all. Write zeros in front if you need them.
Final answer:

Part 2Apply itreal-world problems

4Complete each step, then write the final answer.

A car uses 1.8 gallons of gas each hour. How many gallons does it use in 2.5 hours?
Show your work
Hint Multiply 18 × 25. Each factor has 1 decimal place.
Final answer:

Explain your thinkingJay got 0.6. How does counting decimal places help you fix his answer?

Sentence starter The factors have ___ decimal places in all, so ___. · Jay's answer has only ___ decimal place, but it needs ___.

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