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Postman Stories for Multiplying Integers. What do you think?. Should a check be represented by a positive number, or a negative one?. What do you think?. Should a check be represented by a positive number, or a negative one?

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what do you think
What do you think?
  • Should a check be represented by a positive number, or a negative one?
what do you think1
What do you think?
  • Should a check be represented by a positive number, or a negative one?
  • Should a bill be represented by a positive number, or a negative one?
remember
Remember . . .
  • Checks are positive numbers.
    • A check for $3 may be written as 3.
  • Bills are negative numbers.
    • A bill for $7 may be written as -7.
what do you think2
What do you think?
  • If the postman brings you mail, do you have more mail than before, or less?
  • Should this be a positive number, or a negative one?
  • If the postman takes away mail, do you have more mail than before, or less?
  • Should this be a positive number, or a negative one?
remember1
Remember . . .
  • If the postman brings you mail, it is represented by a positivenumber.
    • If he brings you 6 pieces of mail, write 6.
  • If the postman takes away mail, it is represented by a negative number.
    • If he takes away 10 pieces of mail, write -10.
let s practice
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
let s practice1
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
  • Suppose each piece of mail was a check for $10. How would you write this number?
let s practice2
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
  • Suppose each piece of mail was a check for $10. How would you write this number?
  • What multiplication problem represents this situation?
let s practice3
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
  • Suppose each piece of mail was a check for $10. How would you write this number?
  • What multiplication problem represents this situation?

5x10 = ?

let s practice4
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
  • Suppose each piece of mail was a check for $10. How would you write this number?
  • What multiplication problem represents this situation?

5x10 = 50

check it
Check It!

5x10 = 50

  • Does the answer +50 make sense? Did you gain $50 when he brought you 5 checks for $10 each?
let s practice5
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
  • Suppose each piece of mail was a bill for $10. How would you write this number?
let s practice6
Let’s practice!
  • Suppose the postman brings you 5 pieces of mail. How would you write this number?
  • Suppose each piece of mail was a bill for $10. How would you write this number?
  • What multiplication problem is this?
  • What’s the answer to that multiplication problem?
let s practice7
Let’s Practice!
  • The postman brought you 5 pieces of mail.
  • Each piece of mail was a bill for $10.

5X-10 = -50

does it make sense
Does it make sense?
  • The postman brings you 5 pieces of mail.
  • Each piece of mail is a bill for $10.
  • You lost $50. This is the number -50!
  • Equation:

5X-10 = -50

  • You lost $50. This is the number -50!
let s practice8
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
  • How can we express this mathematically?
let s practice9
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
  • How can we express this mathematically?

(Write an expression!)

let s practice10
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
  • How can we express this mathematically?

(Write an expression!)

-5X10 = ?

let s practice11
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
  • Solution:

-5X10 = -50

let s practice12
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
let s practice13
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
  • Write a math problem for this situation

and solve it.

let s practice14
Let’s Practice
  • When you paid your bills, the postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.

-5 x10 = -50

does it make sense1
Does it make sense?
  • The postman took away 5 pieces of mail.
  • Each piece of mail was a check for $10.
  • Equation:

5X-10 = -50

  • You have $50 less than before. This is the answer: -50!
last practice
Last Practice
  • It’s time to bill your customers for your business!
  • The postman takes away 5 pieces of mail.
  • Each piece of mail is a bill for $10.
last practice1
Last Practice
  • It’s time to bill your customers for your business!
  • The postman takes away 5 pieces of mail.
  • Each piece of mail is a bill for $10.
  • Write an equation for this.
last practice2
Last Practice
  • The postman takes away 5 pieces of mail.
  • Each piece of mail is a bill for $10.
  • Equation:

-5X-10 = 50

does it make sense2
Does It Make Sense?
  • The postman takes away 5 pieces of mail.
  • Each piece of mail is a bill for $10.
  • Equation:

-5X-10 = 50

You made $50!

That’s why the answer is +50.

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