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Learning Objective Name __________________________ Today, we will multiply decimal numbers. CFU

Learning Objective Name __________________________ Today, we will multiply decimal numbers. CFU What are we going to do today? Activate (or provide) Prior Knowledge. 3. factors. 4. 12. product. Multiplication is repeated addition of equal groups .

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Learning Objective Name __________________________ Today, we will multiply decimal numbers. CFU

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  1. Learning ObjectiveName __________________________ Today, we will multiply decimal numbers. CFU What are we going to do today? Activate (or provide) Prior Knowledge 3 factors 4 12 product • Multiplication is repeated addition of equal groups. • A factor is a number used in a multiplication problem. • The product is the answer to a multiplication problem. Solve the multiplication problems on your whiteboards. 2 1 2. 1. 8 6 0 3 7 8 CFU Students, you already know how to multiply with whole numbers. Today, we will use these skills to multiply decimal numbers.

  2. Concept Development • To multiply is to do repeated addition of equal groups. • A decimal number represents a whole number and a part of a whole number separated by a decimal point. • To multiply decimal numbers: • Decimal numbersdo not need to be lined up by place value. • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiplying Decimal Numbers 2.15 2.15 2.15 2.15 2.15 Jimmy receives $2.15 every day for allowance. How much will he have if he saves his money for five days? 2 + 10.75 Jimmy will have $10.75 if he saves his allowance for five days. CFU On your whiteboard, write a decimal number. How do you know it is a decimal number? Look at the multiplication problem on the right. How many decimal places would there be on the right in the product? A 1 B 2 C 3 D 4 Between which two digits would the decimal point be placed in the product? In your own words, what is the main difference between multiplying whole numbers and decimal numbers? The main difference is _____________. 1 3 2 6 8 1 3 2 6 8 Flashcards Decimal Point Placement

  3. Skill Development/Guided Practice Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiply decimal numbers. CFU (#2) How did I/you count the total number of decimal places in the two factors? (#2a) How did I/you place a decimal in the product that many places to the left?

  4. Skill Development/Guided Practice (continued) Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiply decimal numbers. CFU (#2) How did I/you count the total number of decimal places in the two factors? (#2a) How did I/you place a decimal in the product that many places to the left?

  5. Relevance One inch equals 2.54 centimeters. A box is 14 inches long, how many centimeters long is it? 2.54 x 14 35.56 The box is 35.56 centimeters long. • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. • Multiplying decimal numbers will help you determine the cost of multiple items. • Multiplying decimal numbers will help you convert measurement. • Multiplying decimal numbers will help you do well on tests. CFU Does anyone else have another reason why it is relevant to multiply decimal numbers? (pair-share) Why is it relevant to multiply decimal numbers? You may give me one of my reasons or one of your own. Which reason is most relevant to you? Why?

  6. Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Skill Closure Multiply decimal numbers. 1. 2. Concept Closure Look at the multiplication problem below. Where would you place the decimal points in the factors if the product was 1.6892? Explain your answer.Hint: There are multiple answers. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

  7. Independent Practice Name _____________________________ Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiply decimal numbers.

  8. Periodic Review 1 Name _____________________________ Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiply decimal numbers.

  9. Periodic Review 2 Name _____________________________ Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiply decimal numbers.

  10. Periodic Review 3 Name _____________________________ Multiply Decimal Numbers 2 decimal places 0 decimal places 2 decimal places • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Multiply decimal numbers.

  11. Flashcards (Decimal Point Placement) • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Teacherwith CFU If the product is 231.15, where would the decimal points be in the factors? How did I know where to put the decimal point for each factor?

  12. Flashcards (Decimal Point Placement) • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Studentwith CFU If the product is 10.528, where would the decimal points be in the factors? How did you know where to put the decimal point for each factor?

  13. Flashcards (Decimal Point Placement) • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Student If the product is 0.4504, where would the decimal points be in the factors?

  14. Flashcards (Decimal Point Placement) • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Student If the product is .52241, where would the decimal points be in the factors?

  15. Flashcards (Decimal Point Placement) • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Student If the product is 41.28, where would the decimal points be in the factors?

  16. Flashcards (Decimal Point Placement) • To multiply decimal numbers: • The number of decimal places in the product is equal to the total number of decimal places in the numbers being multiplied. Studentwith CFU If the product is 1.6, where would the decimal points be in the factors? How did you know where to put the decimal point for each factor? Back to Skill Development

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