Multiplying Decimals.

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Presentation transcript:

Multiplying Decimals

Steps for Multiplying Decimals Line up the numbers as if they were whole numbers. (You DON’T have to line up the decimal point!) Multiply as if the numbers were whole numbers. Count the total number of decimal places in the factors. The product MUST have the same number of decimal places as the factors.

Multiplying Decimals 9.52 x 38 361.76

Multiplying Decimals 13.2 x 545 719.4

Multiplying Decimals 1.24 x 8 9.92

Multiplying Decimals 0.003 x 64 0.192

Multiplying Decimals 7.49 x 102 763.98

Multiplying Decimals 1.93 x 37 71.41

Multiplying Decimals 4.351 x 25 108.775

Multiplying Decimals 2.45 x 8 19.6

Multiplying Decimals 8.92 x 41 365.72

Word Problems Marty runs tract at Mountain View High School in Tucson. He ran the 200-meter dash in 35.2 seconds. It took Jenny 2 times as long as Marty to run the 200-meter dash. How long did it take Jenny to run the 200-meter dash? 70.4seconds

Word Problems Zach bought 5 pounds of oranges for $0.90 per pound. How much did Zach spend on oranges? $4.50

Word Problems Kara weighs 74 pounds. Her mom weighs 1.8 times as much as she does. How much does Kara’s mom weigh? 13.2 pounds

Word Problems Mary is buying candy for her birthday party. She bought 3 pounds of gummy bears for $1.25 per pound. She bought 5 pounds of M&Ms for $4.50 per pound. She bout 2 pounds of licorice for $2.99 per pound. How much money did Mary spend in all? $32.23

Conclusion What is the most important thing to remember when multiplying a whole number and a decimal? How is this different from adding decimals?