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Unit 3 Multiplication & Division

Unit 3 Multiplication & Division. Parent Preview. Multiplication Facts. Students will be timed on their multiplication facts On Grade students must master their 0-10 facts Above Grade students must master 0-12 facts. Multiplication Strategies. Groups of: 3 groups of 4 = 12

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Unit 3 Multiplication & Division

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  1. Unit 3Multiplication & Division Parent Preview

  2. Multiplication Facts • Students will be timed on their multiplication facts • On Grade students must master their 0-10 facts • Above Grade students must master 0-12 facts.

  3. Multiplication Strategies • Groups of: • 3 groups of 4 = 12 • Repeated Addition: • Add 3 Four separate times 3 + 3 = 6 + 3 = 9 + 3 = 12

  4. Multiplication Strategies Continued • Arrays: • 3 x 5 (down x across) x x x x x x x x x x x x x x x • Number Lines: (see next slide)

  5. Number Line Multiplication Spaces x Jumps 5 x 6 0 5 10 15 20 25 30

  6. Division Strategies • Groups of: • 21 ÷ 3 = 5 • Repeated Subtraction: 21 ÷ 3

  7. Fact Families 48 x ÷ 6 ______ x _______ ________ ÷ ________ _____ x ________ ________ ÷ ________

  8. Comparison Multiplication • Students will be able represent multiplication through pictures Sally Kelly Sally has ____ times as many pandas as Kelly does.

  9. Multiplication & Division Word Problems • Students must be able to write their own multiplication word problem • Ex: Karen has 5 oranges. Jeff has 2times as many oranges as Karen does. How many oranges does Jeff have?

  10. Multiplication & Division Word Problems Continued… • When given a word problem students will need to evaluate the problem to determine if they need to multiply or divide. • Ex Multiplication: There are 5 trees in Susan’s backyard. There are 4 birds sitting on each tree. How many total birds are there? • Ex Division: Jason has 40 baseball cards and 8 shoeboxes. He wants to put an even number of cards in each box. How many cards will go in each box?

  11. Estimating the Product 45 50 x 6 x 6 300

  12. 3rd Grade Challenge

  13. Expressions • Use the strategy of PEMDAS • P Parenthesis • E Exponents (we will not solve problems with exponents) • M Multiplication • D Division • A Addition • S Subtraction (56 ÷ 7) x 4 =

  14. Commutative Property If number sentence is reversed you will always have the same answer • ( 4 + 3 = 7 OR 3 + 4 = 7……5 x 6 = 30 OR 6 x 5 = 30)

  15. Commutative Property • If an addition/multiplication number sentence is reversed the sum/product will remain the same • Example: 4 + 3 = 7 OR 3 + 4 = 7 • Example:4 x 3 = 12OR 3 x 4 = 12

  16. Factors and Multiples • Factor – numbers that multiply together to get a product • Factors of 10 are: 1, 10, 5, 2 • Multiple – Product of a number x number • Multiples of 10 are: 10, 20, 30, 40, 50, etc.

  17. Solving for the Unknown • The unknown will be represented by a letter (ex: x, y, p) • 46 + p = 50 • p = 4 • Function Tables • Rule: y = x + 5

  18. Solving for the Unknown Word Problem • Jason has 25 toy cars. He adds in some toy trucks. He now has a total of 52 toys. • Students will have to identify… • What 25 represents • What 52 represents • What the unknown is • Students will have to… • Create an equation • Solve for the unknown

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