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Multiplication and Division

Multiplication and Division. By M.Veerasakdi. Objectives: At the end of the lesson, the students will be able to: multiply 3-digit numbers by 2-digit number; analyze and solve word problems involving multiplication; answer the exercises accurately. Chapter 2. Multiplication and Division.

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Multiplication and Division

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  1. Multiplication and Division By M.Veerasakdi.

  2. Objectives: • At the end of the lesson, the students will be able to: • multiply 3-digit numbers by 2-digit number; • analyze and solve word problems involving multiplication; • answer the exercises accurately.

  3. Chapter 2 Multiplication and Division 1.Multiplication = to repeat the same addition numbers 2. Properties of Multiplication = quality of multiplication 3.Multiplicand = a number to be multiplied by another number 4.Multiplier = the number by which another number is multiplied 5. Product = the result of multiplication

  4. 6.Division = the process of dividing one number by another 7.Dividend = a number to be divided by another 8.Divisor = a number used to divide another 9.Quotient = the result of division 10.Remainder = number left over 11. Word problems = mathematics exercise expression

  5. ‘Long’multiplication eg. 272 x 13 2 7 2 x 1 3 Finished! 2 8 1 6 + 2 7 2 0 3 5 3 6

  6. ‘Long’multiplication eg. 624 x 37 6 2 4 x 3 7 Finished! 1 2 1 4 3 6 8 + 1 8 7 2 0 2 3 0 8 8

  7. ‘Long’multiplication eg. 582 x 75 5 8 2 x 7 5 Finished! 1 4 1 5 2 9 1 0 + 4 0 7 4 0 4 3 6 5 0

  8. Wrap up Page 22 • 0 2) 19 3) 0 • 0 5) 1 6) 38 • 7) 1 8) 9 9) 230 • 4,600 11) 10 12) 2,400 • 13) 2,400 14) 10 15) 16,100

  9. Properties of multiplication Page 23 1. Find the following… a) 5 x 7 = 35 b) 6 x 12 = 72 c) 24 x 5 = 120 7 x 5 = 35 12 x 6 =725 x 24 = 120 2. Find in the blank space… a) ( 2 x 3 ) x 4 = 6 x 4 = 24 b) ( 4 x 5) x 8 = 20 x 8 x = 160 2 x ( 3 x 4 ) = 2 x 12 = 24 4 x ( 5 x 8 ) = 4 x 40 = 160

  10. Page 23-24 3. Make each of the following … a) 6 x 1 = 6 = 1 x 6 b) 10 x 1 = 10 = 1 x 10 c) 15 x 1 = 15 = 1 x 15 d) 20 x 1 = 20 = 1 x 20 Exercise 2.1 • Fill in the blanks using…. • 1. 1 2. 0 3. 0 4. 20 5. 1 • 6. 520 7. 68 8. 7,200 9. 1 10. 0

  11. Page 24-25 Exercise 2.2 • Find the product… • 1. 3,500 2. 3,689 • 3. 37,660 4. 37,112 • 5. 7,974 6. 86,472 • 7. 23,795 8. 51,828 • 9. 77,024 10. 237,792

  12. Page 27 Exercise 2.3 • Complete the following…… • 1. 14,000 6. 726,000 • 2. 48,000 7. 119,000 • 3. 2,135,000 8. 248,000 • 4. 216,000 9. 621,000 • 5. 25,000 10. 20,000

  13. Page 27 Exercise 2.3 • B. See how quickly you can • 1. 7,840 2. 78,4000 3. 156,800 • 4. 3,920,000 5. 7,300 6. 7,3000 • 7. 292,000 8. 328,5000 9. 40,800 • 10. 40,800 11. 81,600 12. 952,000

  14. Page 28 Exercise 2.4 B. Fill in the box with the correct number. 1. 11,718 2. 64,108 3. 28,035 4. 44,850 Exercise 2.5 1. 29,248 2. 16,569 3. 31,520 4. 65,052 5. 10,848 6. 37,002 7. 26,640 8. 55,200 9. 25,912 10. 72,072 11. 19,530 12. 11,950

  15. B. Find the following products. 1) 19,350 2) 33,004 3) 32,984 4) 39,339 5) 23,478 6) 9,828 7) 8,568 8) 41,595 Exercise 2.6 • 285 x 65 = • Answer : 18,525 ฿

  16. 2. 257 x 52 = • Answer : 13,364 ฿ • 3. 568 x 97 = • Answer : 55,096 tins. • 4. 520 x 55 = • Answer : 28,600 ฿

  17. 5. 260 x 85 = • Answer : 22,100 pages • 6. 350 x 90 = • Answer : 31,500 ฿

  18. Objectives: • At the end of the lesson, the students will be able to: • determine the quotient of a whole number by a 1-digit number without remainder; • calculate the quotient of a whole number by 10; • analyze and solve 3-step word problems involving division; • answer the problems accurately and diligently.

  19. Long Division Steps • DAD (Divide) • MOM (Multiply) • SISTER (Subtract) • BROTHER (Bring Down) • ROVER (Repeat/Remainder)

  20. This is a sample long division problem 1 4 8 r 4 Quotient Answer Number doing the dividing. 68 9 2 Divisor -6 Dividend Number being divided 2 9 -2 4 5 2 -4 8 4

  21. DAD (divide) 14 8 r 4 1.Divide 8 by 6 2.6goes into 8 once, so put 1 above the 8. 3.6 goes into 29 4 times. 4. 6 goes into 52 8 times. 68 9 2 -6 Dad Mom Sister Brother Rover 2 9 -2 4 5 2 -4 8 4

  22. MOM (multiply) 1. After you divide 6 into 8 one time, you will multiple 1 x 6 and write it under the 8. 2. You will do this step after each time you divide. 148 r 4 6 8 9 2 Dad Mom Sister Brother Rover -6 2 9 -2 4 5 2 -4 8 4

  23. SISTER (subtract) 1.After you multiply 1 x 6 you will subtract 8 - 6 which equals 2. 2. After each time you multiply, you will subtract the two numbers. 1 4 8 r 4 6 8 9 2 Dad Mom Sister Brother Rover -6 2 9 -2 4 5 2 -4 8 4

  24. BROTHER (bring down) 1. After subtracting, you need to look back to the dividend to see if there are more numbers to bring down. If so move the number next to the subtracted number. 1 4 8 r 4 6 8 92 Dad Mom Sister Brother Rover -6 2 9 -2 4 5 2 -4 8 4

  25. ROVER (repeat/remainder) 1. After you Divide, Multiply, Subtract, and Bring Down, you start the process over until there are no more numbers to bring down. 2. If there is a number other then ‘0’ after the last time you subtract, that number becomes your remainder. 1 4 8 r 4 6 8 9 2 Reflection -6 Dad Mom Sister Brother Rover 2 9 -2 4 5 2 -4 8 4

  26. Multiplication Tables Online Math Game Math Game Math Test Online

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