DECIMALS Rounding Decimals Review and Multiplying Decimals copyrightamberpasillas

Rounding Review Decimals are read as “and” copyright©amberpasillas 2010 Ten Thousandths Read as 518 and 21 hundredths Thousandths Hundredths Ones Tens Hundreds Thousands 2 1 ___ ___ Tenths 5 1 8 ___ , ___ ___

Rounding Review 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 copyright©amberpasillas 2010

Rounding Review Round to the nearest tenths Round to the nearest hundredths 2. 876

Rounding Review Round to the nearest tenths Round to the nearest hundredths 3. 478

Multiplying Decimals Steps for Multiplying Decimals Step 1: Step 2: Write the problem vertically. Ignore the decimal point(s) and multiply. Determine where the decimal point goes in the product. Step 3: Place the decimal point in the answer by counting how many places the decimal point has moved. copyright©amberpasillas 2010

Multiplying Decimals Multiply 3 x 0. 14 = 0. 14 3 x 0. 14

Multiplying Decimals Multiply 3 x 0. 14 x 1 0. 14 Step 1: Write the problem vertically 3 0 42 Step 2: Ignore the decimal points and multiply 0. 42 Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left copyright©amberpasillas 2010

Multiplying Decimals Multiply 5 x 0. 18 = 0. 18 5 x 0. 18

Multiplying Decimals Multiply 5 x 0. 18 x 4 0. 18 Step 1: Write the problem vertically 5 0 90 Step 2: Ignore the decimal points and multiply 0. 90 Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left copyright©amberpasillas 2010

Multiplying Decimals Multiply 0. 2 x 0. 6 = 0. 2 0. 6 copyright©amberpasillas

Multiplying Decimals Multiply 0. 2 x 0. 6 0. 2 Step 1: Write the problem vertically x 0. 6 0 12 Step 2: Ignore the decimal points and multiply 0. 12 Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left copyright©amberpasillas 2010

Multiplying Decimals Multiply 0. 4 x 0. 7 = 0. 4 0. 7 copyright©amberpasillas

Multiplying Decimals Multiply 0. 4 x 0. 7 0. 4 Step 1: Write the problem vertically x 0. 7 0 28 Step 2: Ignore the decimal points and multiply 0. 28 Step 3: Determine where the decimal point goes in the product. The decimal moves two places to the left copyright©amberpasillas 2010

Multiplying Decimals 200 x. 25 0 100 + 4 000 5000 . Move the

Multiplying Decimals HOW MANY DECIMAL PLACES? 1) 3. 1(0. 28) 3. 1 0. 28 0. 868 1 decimal place 2 decimal places 1 + 2 = 3 decimal places 2) (0. 4)(2. 53) 0. 4 1 decimal place 2. 53 2 decimal places 1. 012 1 + 2 = 3 decimal places copyright©amberpasillas 2010

Multiplying Decimals 1 1) 0. 16 x 30 0 00 480 2) 70 x

Evaluate The Power An exponent tells how many times a number is multiplied by itself. 4 Base 4 3 Exponent 3 is written as 3 • 3 • 3 = 81 This exponent is read three to the fourth power. copyright©amberpasillas 2010

Evaluate The Power Evaluate (0. 2) 2 This means (0. 2) 0. 2 x

Calculate Area With Decimals 0. 58 in. Area = base x height 4 in. The decimal moves two places to the left. Multiply 4 x 0. 58 2 3 0. 58 x 4 2 32 2. 32 in copyright©amberpasillas 2010 2 Area is square units!

THE END!!! Take out your study guide copyright©amberpasillas 2010

#5 Multiplying Decimals 1 0. 14 x 0. 4 Multiply 0. 4 x 0. 14 Step 1: Write the problem vertically 0 0 56 Step 2: Ignore the decimal points and multiply 0. 056 Step 3: Determine where the decimal point goes in the product. The decimal moves 3 places to the left. copyright©amberpasillas 2010

#6 Evaluate The Power Evaluate (0. 5) 2 This means (0. 5) The decimal

#7 The Area (A) is the number of square units needed to cover a figure. Area = base x height 0. 98 in 2 in. The decimal moves two places to the left. Multiply 2 x 0. 98 1 1 0. 98 x 2 1 96 1. 96 in copyright©amberpasillas 2010 2 Area is square units!