5th Grade Module 2 – Lesson 9 Lesson 9: I can fluently multiply multi-digit whole numbers using the standard algorithm to solve multi-step word problems. 5th Grade Module 2 – Lesson 9

Multiply and Divide by Exponents Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones Tenths Hundredths Thousandths 4 5 4 5 Multiply it by 102 Write 45 tenths as a decimal. Say the decimal. 5th Grade Module 2 – Lesson 9

Multiply and Divide by Exponents Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones Tenths Hundredths Thousandths 4 4 Multiply by 102 Write 4 tenths as a decimal. Say the decimal. 5th Grade Module 2 – Lesson 9

Multiply and Divide by Exponents Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones Tenths Hundredths Thousandths 4 4 Divide by 102 Write 4 tenths as a decimal. Say the decimal. 5th Grade Module 2 – Lesson 9

Multiply and Divide by Exponents Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones Tenths Hundredths Thousandths 8 9 5 3 5 9 8 3 Write three and eight hundred ninety five thousandths as a decimal. Multiply by 103 Say the decimal. 5th Grade Module 2 – Lesson 9

Multiply and Divide by Exponents Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones Tenths Hundredths Thousandths 4 7 2 5 4 7 2 5 Write 5,472 as a decimal. Divide by 103 Say the decimal. 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 9 Estimate Products 421 x 231 ≈ ____ x ___ = ____ 400 200 80,000 On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product. 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 9 Estimate Products 523x 298≈ ____ x ___ = ____ 500 300 15,000 On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product. 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 9 Estimate Products 684x 347≈ ____ x ___ = ____ 700 300 21,000 On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product. 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 9 Estimate Products 908 x 297 ≈ ____ x ___ = ____ 900 300 27,000 On your boards, write the multiplication sentence rounding each factor to arrive at a reasonable estimate of the product. 5th Grade Module 2 – Lesson 9

Let’s read the word problem aloud. An office space in New York City measures 48 feet by 56 feet. If it sells for $565 per square foot, what is the selling price of the office space? Concept Development How do we solve this problem? Turn and talk. Let’s read it again sentence by sentence and draw as we go... We are going to solve the first page of problems from your Problem Set together! Please open to page 2.B.85 Let’s read the word problem aloud. 56 x 48 = 2688 sq ft 56 ft 48 ft $565 each 2688 x $565 = $1,518,720 The cost of the office space is $1,518,720 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 9 Concept Development Gemma and Leah are both jewelry makers. Gemma made 106 beaded necklaces. Leah made 39 more necklaces than Gemma. Each necklace they make has exactly 104 beads on it. How many beads did both girls use altogether while making their necklaces. At a recent craft fair, Gemma sold her necklaces for $14 each. Leah sold her necklaces for $10 more. Who made more money at the craft fair? How much more? 5th Grade Module 2 – Lesson 9

Let’s draw a tape diagram to help us… Each necklace used 104 beads. How can we find the total number of beads? Gemma 106 Leah 39 145 (106 x 104) + (145 x 104) = 11,024 + 15,080 = 26,104 Both girls used 26,104 beads altogether. 5th Grade Module 2 – Lesson 9

Leah made more money. Leah made $1996 more than Gemma. Let’s solve Part B now… Gemma 106 Leah 145 (145 x 24) - (106 x 14) = 3480 - 1484 = $1996 5th Grade Module 2 – Lesson 9

Get Ready to Complete the Rest of the Problem Set on Your Own! Complete Page 2.B.86 You will have 10 minutes to work. Try your Best! 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 9 Debrief Share and explain to your partner the numerical expression you wrote to help you solve Problems 3 and 5 Explain how Problems 3 and 5 could both be solved in more than one way What type of problem are Problem 1 and Problem 5? How are these two problems different from the others? 5th Grade Module 2 – Lesson 9

5th Grade Module 2 – Lesson 11 EXIT TICKET Page 2.B.87 5th Grade Module 2 – Lesson 11