Module 2 Lesson 9Fluently multiply multi-digit whole numbers using the standard algorithm to solve multi-

step word problems.

• 5.OA.2 Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation “add 8 and 7, then multiply by 2” as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product.

• 5.NBT.5 Fluently multiply multi-digit whole numbers using the standard algorithm.

Common CoreStandards

Learning Targets

•I can fluently multiply multi-digit whole numbers using the standard algorithm to solve multi-step word problems.

Activate Knowledge

Write 45 tenths as a decimal

Activate Knowledge

Write 45 tenths as a word name

Activate Knowledge

Multiply 45 tenths by 102

Activate Knowledge

Write 4 tenths as a decimal

Activate Knowledge

Write 4 tenths as a word name

Activate Knowledge

Multiply 4 tenths by 102

Activate Knowledge

Divide 4 tenths by 102

Activate Knowledge

Write 3895 thousandths as a decimal

Activate Knowledge

Write 3895 thousandths as a word name

Activate Knowledge

Multiply 3895 thousandths by 103

Activate Knowledge

Write 3895 thousandths as a decimal

Activate Knowledge

Write 3895 thousandths as a word name

Activate Knowledge

Multiply 3895 thousandths by 103

Activate Knowledge

412 × 231 ≈ ____ × _____ = _____

Activate Knowledge

523 × 298 ≈ ____ × _____ = _____

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684 × 347 ≈ ____ × _____ = _____

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908 × 297 ≈ ____ × _____ = _____

Learn

Problem 1

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?

Learn

Problem 2

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?

Learn

Problem 2

Gemma and Leah are both jewelry

makers. Gemma made 106 beaded

necklaces. Leah made 39 more

necklaces than Gemma.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?

Practice

Review