MULTIPLY AND DIVIDE INTEGERS 7 th Grade math

MULTIPLY AND DIVIDE INTEGERS 7 th Grade math

MULTIPLYING INTEGERS

MULTIPLYING INTEGERS Easy, breezy, lemon, squeezy!!

Remember: Represents 4 groups of 2 OR 2 groups of 4 Model the following problem on the number line: 4 • 2

Remember: Represents 2 groups of -3 OR The opposite of 3 groups of 2 Model the following problem on the number line: -3 • 2

SO, WHAT’S THE RULE? If the factors have the same sign, your product is POSITIVE. If the factors have a different sign, your product is NEGATIVE. SAME SIGN = POSITIVE Product DIFFERENT SIGNS = NEGATIVE Product

MULTIPLYING INTEGERS – CHECK YOUR ANSWERS ON NEXT SLIDE

MULTIPLYING INTEGERS – ANSWERS!!

INDEPENDENT PRACTICE Glencoe Skills Practice � 2 -6 Additional Practice: � If needed, Glencoe Practice 2 -6 � Mastery, Integer Maze Glencoe 2 -6

DIVIDING INTEGERS Fact Families: � Using multiplication and division, show the fact families for the following problems. 8, 2, 16 3, 9, 27 4, 5, 20 2 • 8 = 16 3 • 9 = 27 4 • 5 = 20 8 • 2 = 16 9 • 3 = 27 5 • 4 = 20 16 ÷ 2 = 8 27 ÷ 9 = 3 20 ÷ 4 = 5 16 ÷ 8 = 2 27 ÷ 3 = 9 20 ÷ 5 = 4

“Develop a Rule” Use your “Fact Family” organizer to develop a rule for dividing signed numbers. 1. - 6 (4) = 4 (- 6) = 2. - 9 • - 4 = -4 • -9=

SO, WHAT’S THE RULE? If the dividend and divisor have the same sign, your quotient is POSITIVE. If the dividend and divisor have different signs, your quotient is NEGATIVE. SAME SIGN = POSITIVE Quotient DIFFERENT SIGNS = NEGATIVE Quotient (LOOK FAMILIAR? !? !? !!)

PRACTICE PROBLEMS 1. 55 ÷ (- 5) 2. 3. -16 ÷ (-4) 4. 32 ÷ - 8 5. -63 ÷ (-7) 6. -81 ÷ 9

INDEPENDENT PRACTICE Glencoe 2 -8