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Objective Divide decimals by whole numbers
Review Vocabulary Quotient The solution in division
Example 1 Divide a Decimal by a 1 -Digit Number Example 2 Divide a Decimal by a 2 -Digit Number Example 3 Round a Quotient
Find Write problem using the division house Put the first number in the house Put the second number outside the house How many times does 3 go into 4? Multiply 3 1 and place under the 4 Subtract 4 - 3 Bring down the 5 1/3
How many times does 3 go into 15? Find Multiply 3 5 and place under the 15 Subtract 15 - 15 Bring down the 9 How many times does 3 go into 9? Multiply 3 3 and place under the 9 Answer: 15. 3 Subtract 9 - 9 Put decimal in answer directly above decimal in house 1/3
Find Answer: 12. 7 1/3
Find Write problem using the division house Put the first number in the house Put the second number outside the house How many times does 22 go into 8? 22 will not go into 8 How many times does 22 go into 86? 2/3
Find Multiply 22 3 and place under the 86 Subtract 86 - 66 Bring down the 9 How many times does 22 go into 209? Multiply 22 9 and place under the 209 Subtract 209 - 198 Annex a 0 and bring down 2/3
Find How many times does 22 go into 110? Multiply 22 5 and place under the 110 Subtract 110 - 110 Put decimal in answer directly above decimal in house Answer: 0. 395 2/3
Find Answer: 0. 36 2/3
During a science experiment, Nita measured the mass of four unknown samples. Her data table is shown below. What is the mean mass of the four samples? Sample 1 6. 23 g Sample 2 5. 81 g Sample 3 5. 93 g Sample 4 6. 47 g Remember: To find the mean, add the data, then divide by how many pieces of data There are 4 pieces of data A+B+C+D Mean = 4 3/3
Sample 1 Mean = A + B + C + D 4 6. 23 + 5. 81 + 5. 93 + 6. 47 Mean = 4 6. 23 g Sample 2 5. 81 g Sample 3 5. 93 g Sample 4 6. 47 g Replace A with Sample 1 of 6. 23 Replace B with Sample 2 of 5. 81 Replace C with Sample 3 of 5. 93 Replace D with Sample 4 of 6. 47 Bring down the 4 3/3
Follow order of operation P E MD AS Mean = A + B + C + D 4 6. 23 + 5. 81 + 5. 93 + 6. 47 Mean = 4 Mean = 24. 44 4 4 24. 44 Fraction bar considered an enclosure Add the numerator Bring down the 4 Write division using the house Put numerator in house Put denominator outside the house 3/3
How many times does 4 go into 2? Mean = 24. 44 4 6 4 24. 44 - 24 04 4 will not go into 2 How many times does 4 go into 24? Multiply 4 6 and place under the 24 Subtract 24 - 24 Bring down the 4 3/3
How many times does 4 go into 4? Mean = 24. 44 4 6. 1 1 4 24. 44 - 24 04 -4 0 Multiply 4 1 and place under the 4 Subtract 4 - 4 Bring down the 4 How many times does 4 go into 4? Multiply 4 1 and place under the 4 Subtract 4 - 4 Put decimal in answer directly above decimal in house Answer: Mean = 6. 11 grams 3/3
* GRID-IN TEST ITEM The birth weights of four babies born at City Hospital last Friday are given in pounds. What is the mean birth weight? Baby 1 7. 35 lb Baby 2 6. 52 lb Baby 3 8. 33 lb Baby 4 7. 68 lb Answer: Mean = 7. 47 lb 3/3
Assignment Lesson 4: 3 Dividing Decimals by Whole Numbers 12 - 26 All
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