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Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit…

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Presentation on theme: "Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit…"— Presentation transcript:

1 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit…

2 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit… For Example :

3 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit… For Example : 1. Multiply 4 x 6

4 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit… For Example : 1.Multiply 4 x 6 = 24 2.Put 4 in the ones place of the answer, and carry your 2 on the tens place above the 5…

5 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit… For Example : 1.Multiply 4 x 6 = 24 2.Put 4 in the ones place of the answer, and carry your 2 on the tens place above the 5… 3.Multiply 4 x 5 and then add the 2 you carried…

6 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit… For Example : 1.Multiply 4 x 6 = 24 2.Put 4 in the ones place of the answer, and carry your 2 on the tens place above the 5… 3.Multiply 4 x 5 and then add the 2 you carried… 4 x 5 = 20 20 + 2 = 22

7 Multiplication and Division of Whole Numbers Let’s start by multiplying numbers that contain 2 or more digits by a single digit… For Example : 1.Multiply 4 x 6 = 24 2.Put 4 in the ones place of the answer, and carry your 2 on the tens place above the 5… 3.Multiply 4 x 5 and then add the 2 you carried… 4 x 5 = 20 20 + 2 = 22 4.Place the result next to the 4 in the answer

8 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example :

9 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5

10 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 1. Multiply 5 x 8

11 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 1. Multiply 5 x 8 = 40 2. Put the 0 in the ones place of the answer and carry the 4 above the tens place in the first row…

12 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 1. Multiply 5 x 8 = 40 2.Put the 0 in the ones place of the answer and carry the 4 above the tens place in the first row… 3.Now multiply 5 x 1 and then add 4

13 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 1. Multiply 5 x 8 = 40 2.Put the 0 in the ones place of the answer and carry the 4 above the tens place in the first row… 3.Now multiply 5 x 1 and then add 4 4.5 x 1 = 5, 5 + 4 = 9 : Place this result in the tens place of the answer…

14 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 1. Multiply 5 x 8 = 40 2.Put the 0 in the ones place of the answer and carry the 4 above the tens place in the first row… 3.Now multiply 5 x 1 and then add 4 4.5 x 1 = 5, 5 + 4 = 9 : Place this result in the tens place of the answer… 5.Multiply 3 x 5

15 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 1. Multiply 5 x 8 = 40 2.Put the 0 in the ones place of the answer and carry the 4 above the tens place in the first row… 3.Now multiply 5 x 1 and then add 4 4.5 x 1 = 5, 5 + 4 = 9 : Place this result in the tens place of the answer… 5.Multiply 3 x 5 = 15 6.Place in the answer…

16 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 7.Drop a zero into the ones place of the next line …

17 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 7.Drop a zero into the ones place of the next line … 8.3 x 8 = 24

18 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 7.Drop a zero into the ones place of the next line … 8.3 x 8 = 24 9.3 x 1 = 3, 3 + 2 = 5

19 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 7.Drop a zero into the ones place of the next line … 8.3 x 8 = 24 9.3 x 1 = 3, 3 + 2 = 5 10.3 x 3 = 9

20 Multiplication and Division of Whole Numbers Now we will multiply a three digit number by a two digit number… For Example : We will begin our multiplication by the number in the second row starting with the ones place… 5 7.Drop a zero into the ones place of the next line … 8.3 x 8 = 24 9.3 x 1 = 3, 3 + 2 = 5 10.3 x 3 = 9 11.Now add the numbers…

21 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6

22 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6 - Since 2 can not divide 1, how many 2’s divide 15 without going over 15 ?

23 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6 - Since 2 can not divide 1, how many 2’s divide 15 without going over 15 ? 2 x 5 = 10 2 x 6 = 12 2 x 7 = 14 - place in answer above the 5 2 x 8 = 16 7

24 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6 Now multiply and subtract… 7 14 1

25 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6 Drop the 6 for the next number to divide… 7 14 1 6

26 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6 7 14 1 6 - how many 2’s divide 16 ?

27 Multiplication and Division of Whole Numbers Now Long Division… we’ll start out easy… 2 ) 1 5 6 7 14 1 6 8 1 6 0 - Multiply and subtract to find remainder…

28 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) :

29 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : - 11 can not divide 10, how many 11’s divide 104 without going over 104 ?

30 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : - 11 can not divide 10, how many 11’s divide 104 without going over 104 ? 11 x 9 = 99 - place in answer above the 4 11 x 10 = 110 9

31 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : - Now multiply and subtract 9 9 9 5

32 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : - Bring down the next digit 9 9 9 5 5

33 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : 9 9 9 5 5 - how many 11’s divide 55 without going over 55 ?

34 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : 9 9 9 5 5 -how many 11’s divide 55 without going over 55 ? -11 x 5 = 55 ( place in answer ) 5

35 Multiplication and Division of Whole Numbers 1 1 ) 1 0 4 5 EXAMPLE # 2 (division ) : 9 9 9 5 5 5 5 5 0 - Now multiply and subtract

36 APPLICATION PROBLEMS EXAMPLE : An offset press feeds at the rate of 140 impressions every hour. How many impressions are made in 4 hours ?

37 APPLICATION PROBLEMS EXAMPLE : An offset press feeds at the rate of 140 impressions every hour. How many impressions are made in 4 hours ? Multiply 140 x 4 We have a given rate of production given over a certain time frame. That rate multiplied by the number of time frames will give total production.

38 APPLICATION PROBLEMS EXAMPLE : An offset press feeds at the rate of 140 impressions every hour. How many impressions are made in 4 hours ? Multiply 140 x 4 140 x 4 0 65 560 impressions

39 APPLICATION PROBLEMS EXAMPLE #2 ( applications ): A welder fabricates 35 steel water tanks for a price of $9,940.00. How much is each water tank cost to produce ?

40 APPLICATION PROBLEMS EXAMPLE #2 ( applications ): A welder fabricates 35 steel water tanks for a price of $9,940.00. How much is each water tank cost to produce ? Divide $9,940 by 35 When you are finding a per item cost, you will always divide the total dollars spent by the number of items produced.

41 APPLICATION PROBLEMS EXAMPLE #2 ( applications ): A welder fabricates 35 steel water tanks for a price of $9,940.00. How much is each water tank cost to produce ? Divide $9,940 by 35 When you are finding a per item cost, you will always divide the total dollars spent by the number of items produced. Each tank costs $284.00 to produce

42 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150

43 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 Dimension A : # of spaces between holes = # holes – 1

44 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 Dimension A : # of spaces between holes = # holes – 1 # of spaces between holes = 7 – 1 = 6

45 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 Dimension A : # of spaces between holes = # holes – 1 # of spaces between holes = 7 – 1 = 6 Distance A = 20” x 6 = 120“ 120

46 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 To find dimension B… 120

47 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 To find dimension B, we will have to first find the distance between the first and last hole. 120

48 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 120

49 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 120

50 EXAMPLE #3 ( applications ): Two sets of holes are drilled in an aluminum plate in the figure below. Find in inches dimensions A and B A = _______ inches B = _______ inches 7 holes equally spaced 5 holes equally spaced 20 A B 30 40 150 120 20


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