# Learn to divide decimals by whole numbers.

## Presentation on theme: "Learn to divide decimals by whole numbers."— Presentation transcript:

Learn to divide decimals by whole numbers.

Remember! Quotient 0.15 5 0.75 Divisor Dividend

Additional Example 1A: Dividing a Decimal by a Whole Number
Find the quotient. 0.84 ÷ 3 0. 2 8 Place a decimal point in the quotient directly above the decimal point in the dividend. Divide as you would with whole numbers. 3 0.84 – 6 24 – 24

Additional Example 1B: Dividing a Decimal by a Whole Number
Find the quotient. 3.56 ÷ 4 0. 8 9 Place a decimal point in the quotient directly above the decimal point in the dividend. Divide as you would with whole numbers. 4 3.56 – 32 36 – 36

Check It Out: Example 1A Find the quotient. 0.72 ÷ 3 0. 2 4 Place a decimal point in the quotient directly above the decimal point in the dividend. Divide as you would with whole numbers. 3 0.72 – 6 12 – 12

Check It Out: Example 1B Find the quotient. 2.96 ÷ 4 0. 7 4 Place a decimal point in the quotient directly above the decimal point in the dividend. Divide as you would with whole numbers. 4 2.96 – 28 16 – 16

Additional Example 2A: Evaluating Decimal Expressions
Evaluate ÷ x for the given value of x. x = 9 0.936 ÷ x 0.936 ÷ 9 Substitute 9 for x. 0. 1 4 Sometimes you need to use a zero as a placeholder. – 9 9 > 3, so place a zero in the quotient and divide 9 into 36. 3 – 0 36 – 36

Additional Example 2B: Evaluating Decimal Expressions
Evaluate ÷ x for the given value of x. x = 18 0.936 ÷ x 0.936 ÷ 18 Substitute 18 for x. 0. 5 2 Sometimes you need to use a zero as a placeholder. – 0 18 > 9, so place a zero in the quotient and divide 18 into 93. 93 – 90 36 – 36

Check It Out: Example 2A Evaluate ÷ x for the given value of x. x = 6 0.636 ÷ x 0.636 ÷ 6 Substitute 6 for x. 0. 1 6 Sometimes you need to use a zero as a placeholder. – 6 6 > 3, so place a zero in the quotient and divide 6 into 36. 3 – 0 36 – 36

Check It Out: Example 2B Evaluate ÷ x for the given value of x. x = 12 0.636 ÷ x 0.636 ÷ 12 Substitute 12 for x. 0. 5 3 Sometimes you need to use a zero as a placeholder. – 0 12 > 6, so place a zero in the quotient and divide 12 into 63. 63 – 60 36 – 36

Multiplication can “undo” division
Multiplication can “undo” division. To check your answer to a division problem, multiply the divisor by the quotient. Remember!

Additional Example 3: Consumer Application Jodi and three of her friends are making a tile design. The materials cost \$ If they share the cost equally, how much should each person pay? \$10.12 should be divided into four equal groups. Divide \$10.12 by 4. \$2. 5 3 Place a decimal point in the quotient directly above the decimal point in the dividend. Divide as you would with whole numbers. 4 \$10.12 – 8 21 – 20 Check 12 2.53  4 = 10.12 – 12 Each person should pay \$2.53.

Check It Out: Example 3 Ty and three of his friends are building a fence. The lumber costs \$ If they share the cost equally, how much should each person pay? \$21.44 should be divided into four equal groups. Divide \$21.44 by 4. \$5. 3 6 Place a decimal point in the quotient directly above the decimal point in the dividend. Divide as you would with whole numbers. 4 \$21.44 – 20 14 – 12 Check 24 5.36  4 = 21.44 – 24 Each person should pay \$5.36.