Multiplying Decimals

Transcription

1 1. When multiplying decimals, the product first. 2. The will help you place the in the product. 3. Last, check to see if your answer is. Problem Estimate Multiply and place decimal 3.78 x 4.1 = 4. When multiplying decimals, you can also follow the following steps to correctly place the. 5. First, multiply the two factors as if they are both (you don t need to line up the decimals) 6. Then, the decimal places in both factors to find out how many places are needed in the product. 7. Start at the of the product and count the number of places in the factors. 8. Use to check 5.67 x 2.2=

2 Practice: Find each product. Use estimation to check. Show all of your work. #1 3.5 x 2.2 = #2 17 x 13.45= # x 3.1= # x 3.2 = # x 0.021= # x 13.9= #7 At Shop and Save Grocery Store, grapes cost $2.39 a pound. If you buy 3.4 pounds, how much will it cost? Round your answer to the nearest cent.

3 Vocabulary Definition Algebraic Example Factors Examples Non-Examples Definition Algebraic Example Product Examples Non-Examples

4 1. 36 x 9 = Find each product: x 32= x 54= x 9 = Find each product: x 32= x 54=

5 Lauren is shopping for her class. She wants to buy each of her classmates a new highlighter. If highlighters cost $0.50 each, how much will it cost her to buy 25 highlighters? Lauren is shopping for her class. She wants to buy each of her classmates a new highlighter. If highlighters cost $0.50 each, how much will it cost her to buy 25 highlighters?

6 2.3 x 5 = 6.21 x 2.2= 2.3 x 5 = 6.21 x 2.2=

7 Joseph is making gift bags for his friends. He needs 12 oranges, which cost $0.55 each. He also needs 24 bags of candy, which cost $1.25 each. How much will he spend on the gift bags in total? Joseph is making gift bags for his friends. He needs 12 oranges, which cost $0.55 each. He also needs 24 bags of candy, which cost $1.25 each. How much will he spend on the gift bags in total?

8 1. When multiplying decimals, estimate the product first. 2. The will help you place the decimal point in the product. 3. Last, check to see if your answer is reasonable Problem Estimate Multiply and place decimal 3.78 x 4.1 = 4 x 4 = When multiplying decimals, you can also follow the following steps to correctly place the decimal point. 5. First, multiply the two factors as if they are both whole numbers (you don t need to line up the decimals) 6. Then, count the decimal places in both factors to find out how many places are needed in the product. 7. Start at the right of the product and count the number of places in the factors. 8. Use estimation to check 5.67 x 2.2=

9 Find each product. Use estimation to check. Show all of your work. Practice: #1 3.5 x 2.2 = 7.7 #2 17 x 13.45= # x 3.1= # x 3.2 = 48.8 # x 0.021= # x 13.9= #7 At Shop and Save Grocery Store, grapes cost $2.39 a pound. If you buy 3.4 pounds, how much will it cost? Round your answer to the nearest cent. $8.13

10 1. 36 x 9 =324 Find each product: x 32= 1, x 54= 6,696 Lauren is shopping for her class. She wants to buy each of her classmates a new highlighter. If highlighters cost $0.50 each, how much will it cost her to buy 25 highlighters? $12.50

11 2.3 x 5 = x 2.2= Joseph is making gift bags for his friends. He needs 12 oranges, which cost $0.55 each. He also needs 24 bags of candy, which cost $1.25 each. How much will he spend on the gift bags in total? $36.60