This document provides instruction on multiplying integers. It begins with the rules for multiplying integers:
1) Positive x Positive = Positive
2) Negative x Negative = Positive
3) Negative x Positive = Negative
4) Any Number x 0 = Zero
Examples are provided to illustrate each rule. The document emphasizes that if the signs are the same, the answer is positive, and if the signs are different, the answer is negative. Students then practice multiplying integers in a group activity before evaluating additional examples.
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2. •Objectives:
•In this lesson, you are expected to:
•1. Use fundamental operations using
different approaches;
•2. Solve word problems involving
fundamental operations of integers.
3. Which of the two integers in each pair has a greater
distance from zero?
+5 & -4
-2 & -9
-10 & -6
+7 & -3
4. •Problem: You want to buy house
that costs Php800,000. You only
have Php500,000. If you buy the
house, what will your debt be?
•If you spend more money than you
have, you go into debt.
7. Adding Integers
Use a number line to help visualize the
addition of integers.
5
2 7
3
6 9
4
2 6
8. Adding Integers
Use a number line to help visualize the
addition of integers.
3
8 5
3
4 1
9. ADDING INTEGERS
•We can use positive and negative counters to model
the addition of integers.
Positive
Integer
Negative Integer
A positive integer paired with a negative integer
form a zero pair. The value of a zero pair is 0.
14. Do you notice a pattern or
rule?
Adding Integers with like
signs.
- When the signs are the
same, add the numbers
together and keep the sign.
15. WE NOW HAVE THE FOLLOWING
GENERALIZATION:
ADDING A POSITIVE INTEGER TO MEANS
MOVING ALONG THE REAL LINE A
DISTANCE OF
UNITS TO THE RIGHT FROM . ADDING A
NEGATIVE INTEGER – TO MEANS
MOVING ALONG THE REAL LINE A
DISTANCE OFUNITS TO THE LEFT FROM.
20. DID YOU NOTICE A PATTERN OR
RULE?
Adding integers with unlike signs.
- When the signs are different,
subtract the integers and keep the
sign of the larger digit.
26. Adding Integers with like signs.
- When the signs are the same, add the numbers
together and keep the sign.
-9 + -3 = -12
Adding integers with unlike signs.
- When the signs are different, subtract the integers and
keep the sign of the larger integer.
-9 + 3 = -6
28. Adding Integers
If the temperature was -7 degrees (Fahrenheit)
at 6 AM, rose 4 degrees by 7 AM and then rose
another 8 degrees by 8 AM, what was the
temperature at 8 AM?
8
4
7 rose
rose
8
4
7
F
5
8
3
31. Quick Review of Adding Integers
• Adding Rule #1
–If the signs are the
same, add as you
normally do.
–Keep the same sign.
• 5 + 8 =
• -8 + -17 =
• Adding Rule #2
– If the signs are
DIFFERENT, pretend the
signs aren’t there.
– Subtract the smaller
from the larger one.
– Keep the sign of the
number with the
GREATEST Absolute
Value.
• 19 + -11 =
• 24 + -86 =
13
-25
8
-62
32. THE HIGHEST POINT IN ASIA IS THE
TOP OF MOUNT EVEREST, AT A HEIGHT
OF 29,028 FEET ABOVE SEA LEVEL.
THE LOWEST POINT IS THE DEAD SEA,
WHICH 1312 FEET BELOW SEA LEVEL.
HOW MUCH HIGHER IS MOUNT
EVEREST THAN THE DEAD SEA?
33. 3 Steps to Subtract
Integers
• Keep
–Keep the 1st number
• Change
–Subtraction sign to Addition
• Opposite
–Write down the opposite of the 2nd
number
-Then add the way you normally
38. GROUP ACTIVITY:
MATERIALS: FLASH CARDS/POWER POINT, SHOW-ME-BOARD
MECHANICS:
A.DIVIDE THE CLASS INTO 5 GROUPS.
B.CHOOSE A LEADER
C. TEACHER FLASHES NUMBERS ON THE SLIDES
D.LEADER WILL WRITE THE CORRECT ANSWER ON THE SHOW-ME-
BOARD
E.THE FIRST GROUP TO FLASH THE CORRECT ANSWER WILL GET 1
POINT
F.THE TEACHER CHECKS THE ANSWERS.
46. (Subtraction of integers means adding the
minuend and the opposite of the subtrahend.) or
Subtract Integers
1.Keep
Keep the 1st number
2.Change
Subtraction sign to Addition
3.Opposite
Write down the opposite of the 2nd number
-Then add the way you normally do.
58. Why?
Positive x Positive = POSITIVE
Your bank records 5 deposits of Php300 each.
5(300) = +1500
Positive x Negative = NEGATIVE
Your bank records 5 withdrawals of Php30 each.
5(-300) = -1500
Negative x Positive = NEGATIVE
Your bank loses track of 5 deposits of Php300 each.
-5(300) = -1500
Negative x Negative = POSITIVE
Your bank loses track of 5 withdrawals of Php300
each.
-5(-300) = +1500
59. Some simple rules will help you when multiplying
negative numbers. The rules are the same for division.
•If there is one negative number, then the answer is
negative.
•If two numbers are negative, then the answer is
positive.
8 x 5 = 40 -8 x 5 = -40
8 x -5 = -40 -8 x -5 = 40
If the signs are the same = positive answer.
If theMultiplication of integers
++ Answer is +
-- Answer is +
+- Answer is -
-+ Answer is -
60. GROUP
ACTIVITY
• Materials: flash cards/power point, show-me-board
• Mechanics:
• a.Divide the class into 5 groups.
• b.Choose a leader
• c. Teacher flashes numbers on the slides
• d.Leader will write the correct answer on the show-me-board
• e.The first group to flash the correct answer will get 1 point
• f.The teacher checks the answers.
• g.The group having the most number of correct answers wins.
64. HOW DO WE MULTIPLY INTEGER
1. IF THE SIGNS ARE THE
SAME THE ANSWER
IS POSITIVE
2. IF THE SIGNS ARE
DIFFERENT THE ANSWER
IS NEGATIVE
65. Try it with your seatmate:
6 x 8 = - 6 x 8 = 6 x -8 = -6 x -
8 =
7 x 4 = -7 x 4 = 7 x -4 = -7 x -4 =
|-8 x 3| = |5 x (-2) – 1| =
2 x |3 – 9| =
6 x 8 = 48 - 6 x 8 = -48 6 x -8 = -48 -6 x -8 = 48
7 x 4 = 28 -7 x 4 = -28 7 x -4 = -28 -7 x -4 = 28
|-8 x 3| = 24 |5 x (-2) – 1| = 11 2 x |3 – 9| = 12
Pair-share: Multiply the ff.
Click for answers:
72. Whenever we divide two
integers with “like” signs, the
answer is always positive.
+ ÷ + = +
𝟏𝟔 ÷ 𝟒 = 𝟒
(−) ÷ (−) = +
−𝟏𝟐 ÷ (−𝟒) = 𝟑
73. Whenever we divide two
integers with “unlike” signs, the
answer is always negative.
What did you notice about the rules
for multiplying and dividing
(+) ÷ (−) = −
𝟗 ÷ −𝟑 = −𝟑
(−) ÷ (+) = −
If you said they’re exactly the
same, you’re right!
−𝟏𝟓 ÷ 𝟑 = −𝟓
74. Some simple rules will help you when
multiplying negative numbers. The rules are
the same for division.
•If there is one negative number, then the
answer is negative.
•If two numbers are negative, then the answer is
positive.
40 ÷ 8 = 5
-40 ÷ -8 = 5
-40 ÷ 8 = -5
If Division of Integers
++ Answer is +
-- Answer is +
+- Answer is -
-+ Answer is -
77. How do we divide integers?
When we divide two integers, the sign rules are
different than when we add or subtract signed
numbers.
When divide two positive integers, the solution is
positive. 12 ÷ 3 = 4
16 ÷ 8 = 2
8 ÷ 8 = 1
78. How do we divide integers?
When we divide two negative
integers, the solution is also
positive.
(-12) ÷ (-3) = 4
(-16) ÷ (-8) = 2
(-8) ÷ (-8) = 1
79. How do we divide integers?
When we divide one positive & one negative
integer, the solution is always negative,
regardless of which is larger or which is
written first.
12 ÷ (-3) = - 4
(-16) ÷ 8 = -2
(-8) ÷ 8 = -1