Module 2 Lesson 12

Multiply decimal fractions by multi-digit whole numbers through conversion to a whole number problem and

reasoning about the placement of the decimal.

• 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 multiply decimal fractions by multi-digit whole numbers through conversion to a whole number problem and reasoning about the placement of the decimal.

Activate Knowledge

12 in = ___ ft.

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24 in = ___ ft.

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36 in = ___ ft.

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48 in = ___ ft.

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120 in = ___ ft.

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1 ft = ___ in.

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2 ft = ___ in.

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2.5 ft = ___ in.

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3 ft = ___ in.

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3.5 ft = ___ in.

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4 ft = ___ in.

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4.5 ft = ___ in.

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9 ft = ___ in.

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9.5 ft = ___ in.

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27 ft = ___ in.

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27.5 ft = ___ in.

Activate Knowledge

Say the number as a decimal8 tenths

Zero point eight

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Say the number as a decimal35 tenths

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Say the number as a decimal45 tenths

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Say the number as a decimal85 tenths

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Say the number as a decimal83 tenths

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Say the number as a decimal63 tenths

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Say the number as a decimal47 tenths

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Say the number as a decimal8 hundredths

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Say the number as a decimal10 hundredths

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Say the number as a decimal20 hundredths

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Say the number as a decimal30 hundredths

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Say the number as a decimal90 hundredths

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Say the number as a decimal95 hundredths

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Say the number as a decimal99 hundredths

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Say the number as a decimal199 hundredths

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Say the number as a decimal299 hundredths

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Say the number as a decimal257 hundredths

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Say the number as a decimal463 hundredths

Activate KnowledgeThirty-two cyclists make a seven day trip. Each

cyclist requires 8.33 kg of food for the entire

trip. If each cyclist wants to eat an equal

amount of food each day, how many kg of

food will the group be carrying at the end of

day 5?

Learn

Problem 1

2.31 x 22

Estimate the product

Learn

Problem 1

2.31 x 22

Predict whether our estimate is greater than or

less than the actual product.

Learn

Problem 1

2.31 x 22

Use an area model to find the product

Learn

Problem 1

2.31 x 22

Solve using the algorithm

Learn

Problem 2

2.31 x 221

Estimate the product

Learn

Problem 2

2.31 x 221

Predict whether our estimate is greater than or

less than the actual product.

Learn

Problem 2

2.31 x 221

Use an area model to find the product

Learn

Problem 2

2.31 x 221

Solve using the algorithm

Learn

Problem 3

2.31 x 201

Estimate the product

Learn

Problem 3

2.31 x 201

Predict whether our estimate is greater than or

less than the actual product.

Learn

Problem 3

2.31 x 201

Solve using the algorithm

Learn

Problem 4

4.95 x 11

Estimate the product

Learn

Problem 4

4.95 x 11

Predict whether our estimate is greater than or

less than the actual product.

Learn

Problem 4

4.95 x 11

Solve using the algorithm

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Problem 5

0.98 × 495

Estimate the product

Learn

Problem 5

0.98 × 495

Predict whether our estimate is greater than or

less than the actual product.

Learn

Problem 5

0.98 × 495

Solve using the algorithm

Learn

Problem 6

102.64 × 495

Estimate the product

Learn

Problem 6

102.64 × 495

Predict whether our estimate is greater than or

less than the actual product.

Learn

Problem 6

102.64 × 495

Solve using the algorithm

Practice

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