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Decimals Multiplication: Learn and Practice Techniques

This lesson aims to master decimal multiplication with whole numbers and decimals, covering vocabulary, representation, and practice problems. Participants will engage in group activities, gallery walks, and reflection exercises. The session also includes real-life scenarios involving decimal multiplication.

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Decimals Multiplication: Learn and Practice Techniques

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  1. Objective To be able to multiply decimals with whole numbers and decimals.

  2. Multiplication Vocabulary – On your whiteboard write _______ 4.5 x 5 22.5 Factor Factor product I decimal

  3. Decimals Represent Fractions 6 8/10 3/100 6/1000 1/10,000 Tenths Hundredths Thousandths Ten thousandths Ones 6 . 8 3 6 1 Notice that every decimal ends with “ths”.

  4. 4.235 4.235 6 6 x x 25 41 0 How to multiply decimals 1 2 Multiply The number of decimal places in the factors is equal to the total number of decimal places in the product. 1 2 3 3 21 . 25 4 1 0 32 1

  5. Copy the problem and place the decimal where it should go 3.2 2 x 5 1 6 . 0

  6. Copy the problem and place the decimal where it should go .32 .32 x 0.5 5 1 6 0 .

  7. Copy the problem and place the decimal where it should go 2.7 7 x 6.1 1 27 +1620 1 6 4 7 .

  8. How many places in would you put the decimal? @.@& X @.$ @ @%@ .

  9. It costs $0.45 to mail a letter and $0.30 to mail a postcard. Carla is going to the post office to mail 3 letters and 1 postcard. How much will she spend?

  10. A car can drive 0.5 mile in one minute. How far can it travel in 4 minutes? 0 0.5 1 1.5 2 2.5 3

  11. A bear weighs 0.4 of a ton. It can walk while holding in its mouth an object weighing 0.5 times as much as its own body weight. What part of a ton can a bear carry?

  12. Your Turn • You will be working in groups of 4 to create a poster. You have 10 minutes. • Gallery Walk • Groups A together, Groups B together • 2 stay and explain, 2 walk the gallery and listen (cycle through all stations on your side 1 minute) • Share with whole class

  13. Objective To be able to multiply decimals with whole numbers and decimals.

  14. Wrap Up • One thing I learned today _____________. • One way you can multiply decimals is_______________.

  15. Ticket out the door • Choose one problem from the worksheet and solve it using one of the representations (money, number line, grid) you explored today.

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