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# Multiplication and Division of Integers

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# Multiplication and Division of Integers

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Reference:
Nivera, G. C. (2013), Grade 7 Mathematics: Pattern and Practicalities. Don Bosco Press Inc. Makati City, Philippines.

For more instructional resources, CLICK me here and DON'T FORGET TO SUBSCRIBE! 
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Reference:
Nivera, G. C. (2013), Grade 7 Mathematics: Pattern and Practicalities. Don Bosco Press Inc. Makati City, Philippines.

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### Multiplication and Division of Integers

1. 1. Grade 7 – Mathematics Quarter I MULTIPLICATION AND DIVISION OF INTEGERS
2. 2. • apply the rules in multiplying and dividing integers; and • solve problems involving multiplication and division of integers.
3. 3. Perform the indicated operation. 6 20 12 56 151. 3 x 5 = 2. 2 x 3 = 3. 5 x 4 = 4. 6 x 2 = 5. 8 x 7 = 2 3 8 6 46. 8 ÷ 2 = 7. 10 ÷ 5 = 8. 18 ÷ 6 = 9. 24 ÷ 3 = 10. 30 ÷ 5 =
4. 4. MULTIPLICATION AND DIVISION OF INTEGERS SYMBOLS MULTIPLICATION (2)(4) parenthesis dot operator/bullet operator 𝟒 𝟐 fraction bar ÷ division symbol DIVISION 2 x 4 multiplication symbol 2 · 4
5. 5. MULTIPLICATION AND DIVISION OF INTEGERS RULE: SAME SIGNS = POSITIVE DIFFERENT SIGNS = NEGATIVE (+)(+) = (+) (-)(-) = (+) (+)(-) = (-) (-)(+) = (-) (+) ÷ (+) = (+) (-) ÷ (-) = (+) (+) ÷ (-) = (-) (-) ÷ (+) = (-)
6. 6. MULTIPLICATION OF INTEGERS 1. ( 2 )( 4 ) = 8 positive positive positive 2. ( -3 )( 5 ) = -15 negative positive negative 3. ( 8 )(-7 ) = -56 positive negative negative 4. ( -9 )(-5 ) = 45 negative negative positive 5. ( 3 )(-7 )(2) = -42 1 odd number negative 6. (-3)(-4)(1)(-2)= -24 1 odd number negative2 3 7. (-3)(5)(-1)(2) = 30 1 even number positive2
7. 7. DIVISION OF INTEGERS 1. 25 ÷ (-5) = -5 positive negative negative 2. -42 ÷ (-7) = 6 negative negative positive 3. 16 ÷ 2 = 8 positive positive positive 4. -20 ÷ 4 = -5 negative positive negative 5. -30 ÷ 5 = -6 negative 6. -90 ÷ (-15) = 6 positive 7. 120 ÷ (-10)= -12 negative 8. [(-3)(4)] ÷ (-6) = 2 positive -12 negativenegative
8. 8. Problem Solving. For each late arrival in class, a student gets 2 demerits. Maria arrives late in class for the fifth time since the school year started. How many demerits has she received? (-2) (5) = -10 demerits Based on the given condition, if a student gets 14 demerits at the end of the year, how many times has she been late for school? (-14) ÷ (-2) = 7 times
9. 9. Think about this. If a and b are integers, what conditions would make a x b > 0 ? If a and b are integers, what conditions would make a x b < 0 ? Answer: a and b must be integers with the same signs (both positive or both negative) Answer: a and b must be integers with different signs (one positive and one negative).
10. 10. Test Yourself. 2. (4)(-3)(-2) = 1. (20)(-4) = 4. [(3)(-6)] ÷ (-2) = 3. (-9)(-2)(2)(-3) = 5. [(9)(4)] ÷ [(3)(-2)] =
11. 11. Answer Key 1. -80 2. 24 3. -108 4. 9 5. -6