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Module 2 Lesson 11. Multiply decimal fractions by multi-digit whole numbers through conversion to a whole number problem and reasoning about the placement of the decimal. Common Core Standards.

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module 2 lesson 11
Module 2 Lesson 11
  • Multiply decimal fractions by multi-digit whole numbers through conversion to a whole number problem and reasoning about the placement of the decimal.
slide2

Common Core

Standards

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.

slide3
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.

Learning Targets

slide10

Activate

Knowledge

3 × 4.1 is?

slide11

Activate

Knowledge

12.3 x 10 ÷ 10 is?

slide12

Activate

Knowledge

3 × 4.1×1 is?

slide13

Activate

Knowledge

3 × 2.4 is?

slide14

Activate

Knowledge

7.2 x 10 ÷ 10 is?

slide15

Activate

Knowledge

3 × 2.4 ×1 is?

slide16

Activate

Knowledge

3 × 4 × 17.6 ÷ 17.6 is?

slide17

Activate

Knowledge

Mr. Mohr wants to build a rectangular patio using concrete tiles that are 12 inches square. The patio will measure 13.5 feet by 43 feet. What is the area of the patio? How many concrete tiles will he need to complete the patio?

slide18

Learn

Compare this problem with theapplication problem

7.38 × 41

Problem 1

slide19

Learn

Estimate the product

7.38 × 41

Problem 1

slide20

Learn

Predict whether our estimate is greater than or less than the actual product.

7.38 × 41

Problem 1

slide21

Learn

Use an area model to find the product

7.38 × 41

Problem 1

slide22

Learn

Solve using the algorithm

7.38 × 41

Problem 1

slide23

Learn

Estimate the product

8.26 × 128

Problem 2

slide24

Learn

Predict whether our estimate is greater than or less than the actual product.

8.26 × 128

Problem 2

slide25

Learn

Use an area model to find the product

8.26 × 128

Problem 2

slide26

Learn

Solve using the algorithm

8.26 × 128

Problem 2

slide27

Learn

Estimate the product

82.51 × 63

Problem 3

slide28

Learn

Predict whether our estimate is greater than or less than the actual product.

82.51 × 63

Problem 3

slide29

Learn

Use an area model to find the product

82.51 × 63

Problem 3

slide30

Learn

Solve using the algorithm

82.51 × 63

Problem 3