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Copyright©amberpasillas2010 DECIMALS Rounding Decimals Review and Multiplying Decimals.

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Presentation on theme: "Copyright©amberpasillas2010 DECIMALS Rounding Decimals Review and Multiplying Decimals."— Presentation transcript:

1 copyright©amberpasillas2010 DECIMALS Rounding Decimals Review and Multiplying Decimals

2 copyright©amberpasillas2010 ___, ___ ___ ___ ___ ___ ___ ___ Thousands Hundreds Tens Ones Ten ths Hundred ths Thousand ths Ten Thousandths 5 1 8 2 1 Read as 518 and 21 h undredths Decimals are read as “and” Rounding Review

3 copyright©amberpasillas2010 Find the number. Circle it. Look next door. 4 or less just ignore. 5 or more add one more. Example: Round 5368 to nearest hundreds. Circle the 3 in the hundreds place. Look next door at the 6. It is 5 or more so add 1 more to the hundreds place. 5368 rounds to 5400 Rounding Review

4 copyright©amberpasillas2010 Round to the nearest tenths 2.876 2.9 Round to the nearest hundredths 31.6999 31.70 Rounding Review

5 copyright©amberpasillas2010 Round to the nearest tenths 3.478 3.5 Round to the nearest hundredths 22.5972 22.60 Rounding Review

6 copyright©amberpasillas2010 Steps for Multiplying Decimals Step 1: Write the problem vertically. Step 2: Ignore the decimal point(s) and multiply. Step 3: Determine where the decimal point goes in the product. Place the decimal point in the answer by counting how many places the decimal point has moved. Multiplying Decimals

7 copyright©amberpasillas2010 Multiply 3 x 0.14 0.14 3 x 0.14 = 0.42 Multiplying Decimals

8 copyright©amberpasillas2010 Multiply 3 x 0.14 2 Step 1: Write the problem vertically 0.14 x 3 Step 2: Ignore the decimal points and multiply Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left 1 40 0.42 Multiplying Decimals

9 copyright©amberpasillas2010 Multiply 5 x 0.18 0.18 5 x 0.18 = 0.90 Multiplying Decimals

10 copyright©amberpasillas2010 Multiply 5 x 0.18 0 Step 1: Write the problem vertically 0.18 x 5 Step 2: Ignore the decimal points and multiply Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left 4 90 0.90 Multiplying Decimals

11 copyright©amberpasillas2010 Multiply 0.2 x 0.6 0.2 0.6 = 0.2 Multiplying Decimals

12 copyright©amberpasillas2010 Multiply 0.2 x 0.6 0.2 0.6 = 0.2x 0.6 Multiplying Decimals

13 copyright©amberpasillas2010 Multiply 0.2 x 0.6 0.2 0.6 = 0.2 x 0.6 = 0.12 Multiplying Decimals

14 copyright©amberpasillas2010 Multiply 0.2 x 0.6 2 Step 1: Write the problem vertically 0.2 x 0.6 Step 2: Ignore the decimal points and multiply Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left 10 0. 12 Multiplying Decimals

15 copyright©amberpasillas2010 Multiply 0.4 x 0.7 0.4 0.7 = 0.4 Multiplying Decimals

16 copyright©amberpasillas2010 Multiply 0.4 x 0.7 0.4 0.7 = 0.4x 0.7 Multiplying Decimals

17 copyright©amberpasillas2010 Multiply 0.4 x 0.7 0.4 0.7 = 0.28 Multiplying Decimals

18 copyright©amberpasillas2010 Multiply 0.4 x 0.7 8 Step 1: Write the problem vertically 0.4 x 0.7 Step 2: Ignore the decimal points and multiply Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left 20 0. 28 Multiplying Decimals

19 copyright©amberpasillas2010 Multiplying Decimals 200 x. 25 0 + 5000 0 001 00 4 Move the decimal two places to the left in your answer..

20 copyright©amberpasillas2010 Multiplying Decimals HOW MANY DECIMAL PLACES? 1 decimal place 3.1 2) (0.4)(2.53) 0.4  2.53 1) 3.1(0.28) 1.012  0.28 2 decimal places 0.868 1 + 2 = 3 decimal places 1 decimal place 2 decimal places 1 + 2 = 3 decimal places

21 copyright©amberpasillas2010 Multiplying Decimals 1) 0.16 x 30 000 08 4 08 4 1 2) 70 x 1.2 041 00 7 04 8 + 3) 1 0.0048 x 32 690 0 44 6 3 5 1 1 1 2 0 0 1 0

22 copyright©amberpasillas2010 Evaluate The Power An exponent tells how many times a number is multiplied by itself. 3 4 Base Exponent 3 is written as 3 3 3 3 = 81 4 This exponent is read three to the fourth power.

23 copyright©amberpasillas2010 Evaluate The Power Evaluate (0.2) 2 4 This means (0.2)(0.2) 0.2 x 0.2 The decimal goes moves two places to the left 00 0. 04

24 copyright©amberpasillas2010 Calculate Area With Decimals 4 in. 0.58 in. Area = base x height Multiply 4 x 0.58 2 0.58 x 4 The decimal moves two places to the left. 3 32 2.32 in 2 2 Area is square units!

25 copyright©amberpasillas2010 THE END!!! Take out your study guide

26 copyright©amberpasillas2010 Multiply 0.4 x 0.14 6 Step 1: 1: Write the problem vertically 0.14 x 0.4 Step 2: Ignore the decimal points and multiply Step 3: Determine where the decimal point goes in the product. The decimal moves 3 places to the left. 1 5 0 0. 056 Multiplying Decimals #5 0

27 copyright©amberpasillas2010 Evaluate The Power Evaluate (0.5) 2 5 This means (0.5)(0.5) 0.5 x 0.5 The decimal moves two places to the left. 20 0. 25 #6 2

28 copyright©amberpasillas2010 2 in. 0.98 in Area = base x height # 7 Multiply 2 x 0.98 6 0.98 x 2 The decimal moves two places to the left. 1 91 1.96 in 2 1 Area is square units! The Area (A) (A) is the number of square units needed to cover a figure.


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