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Multiplication as Repeated Addition

add. multiply. product. sum. Multiplication as Repeated Addition. array. Addition Addition Addition Addition . +. Multiplication. Kim & Gwen enjoy shopping together for birthday presents for all of their relatives who have September birthdays. . Kim bought these items :

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Multiplication as Repeated Addition

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  1. add multiply product sum Multiplication asRepeated Addition array Addition Addition Addition Addition + Multiplication

  2. Kim & Gwen enjoy shopping together for birthday presents for all of their relatives who have September birthdays.

  3. Kim boughtthese items: • Shirt ~$31 • Candles ~$15 • Slippers ~$24 • Photo Album~$17 Gwen could not decide what to get. Finally, she decided to get gift certificates. • Gift Certificate ~ $20 • Gift Certificate ~ $20 • Gift Certificate ~ $20 • Gift Certificate ~ $20

  4. Kim enjoys reading mysteries. She read: • 3 books ~ in September • 5 books ~ in October • 2 books ~ in November • 6 books ~ in December Gwen read historical fiction books. She read: • 4 books ~ in September • 4 books ~ in October • 4 books ~ in November • 4 books ~ in December

  5. Both girls set goals and keep track of how many homework problems they get right during each week. Listed below are their scores for one week. Kim: • Monday ~11 • Tuesday ~15 • Wednesday ~14 • Thursday ~12 Gwen: • Monday ~ 15 • Tuesday ~15 • Wednesday ~ 15 • Thursday ~15

  6. Both girls put a lot of effort into their school work. Even with a busy schedule after school, they both study every Monday through Thursday. How much time does each young lady spend studying? Kim: • Monday ~ 45 • Tuesday ~35 • Wednesday ~ 50 • Thursday ~30 Gwen: • Monday ~ 45 • Tuesday ~45 • Wednesday ~ 45 • Thursday ~45

  7. Both girls spend Sunday afternoons fishing with their parents. Listed below is the number of fish each girl caught last summer. How many fish did each girl catch during those three months? Kim: • June ~ 23 • July ~14 • August ~ 9 Gwen: • June ~ 11 • July ~11 • August ~ 11

  8. Both girls put a few dollars from their allowance into their personal savings account—also known as a piggy bank. Find out how much money each girl saved last year. Gwen: • January ~ $4 • February ~$4 • March ~ $4 • April ~ $4 • May ~ $4 • June ~ $4 • July ~ $4 • August ~ $4 • September ~$4 • October ~ $4 • November ~$4 • December ~ $4 Kim: • January ~ $3 • February ~$5 • March ~ $6 • April ~ $2 • May ~ $8 • June ~ $3 • July ~ $5 • August ~ $3 • September ~$4 • October ~ $11 • November ~$3 • December ~ $2

  9. When do you add? When you are asked to find the total of a group of different numbers When do you multiply? When have to add the same number over and over again

  10. When do you add? When do you multiply? Let’s Revisit the Problems about Kim & Gwen

  11. Kim & Gwen enjoy shopping together for birthday presents for all of their relatives who have September birthdays.

  12. Kim boughtthese items: • Shirt ~$31 • Candles ~$15 • Slippers ~$24 • Photo Album~$17 Gwen could not decide what to get. Finally, she decided to get gift certificates. • Gift Certificate ~ $20 • Gift Certificate ~ $20 • Gift Certificate ~ $20 • Gift Certificate ~ $20

  13. Kim enjoys reading mysteries. She read: • 3 books ~ in September • 5 books ~ in October • 2 books ~ in November • 6 books ~ in December Gwen read historical fiction books. She read: • 4 books ~ in September • 4 books ~ in October • 4 books ~ in November • 4 books ~ in December

  14. Both girls set goals and keep track of how many homework problems they get right during each week. Listed below are their scores for one week. Kim: • Monday ~11 • Tuesday ~15 • Wednesday ~14 • Thursday ~12 Gwen: • Monday ~ 15 • Tuesday ~15 • Wednesday ~ 15 • Thursday ~15

  15. Both girls put a lot of effort into their school work. Even with a busy schedule after school, they both study every Monday through Thursday. How much time does each young lady spend studying? Kim: • Monday ~ 45 • Tuesday ~35 • Wednesday ~ 50 • Thursday ~30 Gwen: • Monday ~ 45 • Tuesday ~45 • Wednesday ~ 45 • Thursday ~45

  16. Both girls spend Sunday afternoons fishing with their parents. Listed below is the number of fish each girl caught last summer. How many fish did each girl catch during those three months? Kim: • June ~ 23 • July ~14 • August ~ 9 Gwen: • June ~ 11 • July ~11 • August ~ 11

  17. Both girls put a few dollars from their allowance into their personal savings account—also known as a piggy bank. Find out how much money each girl saved last year. Gwen: • January ~ $4 • February ~$4 • March ~ $4 • April ~ $4 • May ~ $4 • June ~ $4 • July ~ $4 • August ~ $4 • September ~$4 • October ~ $4 • November ~$4 • December ~ $4 Kim: • January ~ $3 • February ~$5 • March ~ $6 • April ~ $2 • May ~ $8 • June ~ $3 • July ~ $5 • August ~ $3 • September ~$4 • October ~ $11 • November ~$3 • December ~ $2

  18. MATH Vocabulary Word array A rectangular arrangement of quantities in rows and columns

  19. There is a number sentence that goes with this array. 4 rows 3columns 3 x 4 Count the rows and columns to create the multiplication sentence that goes with this array. 4 x 3

  20. Count the rows and columns to create the multiplication sentence that goes with this array. 4 rows 2columns 4 x 2 2 x 4

  21. Count the rows and columns to create the multiplication sentence that goes with this array. 5 rows 3columns 5 x 3 3 x 5

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