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Year 7- Integers

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by

Yee-Ling Ng

on 11 March 2016

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Transcript of Year 7- Integers

INTEGERS
INTEGERS ARE WHOLE NUMBERS THAT CAN BE NEGATIVE, ZERO OR POSITIVE.

E.G. -4, -3, -2, -1, 0, 1, 2, 3, 4
NUMBER LINE
INTEGERS
EACH NEGATIVE NUMBER HAS A POSITIVE OPPOSITE.

E.G. -3 AND 3 ARE EXAMPLES OF OPPOSITE NUMBERS.
INTEGERS
WHERE IN REAL LIFE DO WE USE INTEGERS?
Up and down
the ladder!
8-5=
5-8=
-5-2=
-5+3=
-2+1-4=
-1-1-1-1=
1-1-1-1=
Sign belongs to the number after it
When 2 signs are next to each other
Adding
-2
-3
+
Operation
Direction
=
- 5
When 2 signs are next to each other
Rules
+ + =
+
+ - =
-
- + =
-
- - =
+
=
Examples
3
-4
-
- 3
+
-3
=
=
- 4
-
6
Multiplying Integers
Adding and subtracting Integers
=
-4
-3
=
=
- 4
(-6)
x
x
x
5
(-7)
(-9)
6
Dividing Integers
Multiplying Integers
=
-4
-12
=
=
- 4
(-2)
÷
÷
÷
10
(-4)
(-9)
(3)
Dividing Integers
Text (p. 365)
Q1 (b), Q2 (a, c), Q3, Q4 (a, ce, e, g, j, l, n, p), Q5 (a, c, e, g, j, l, n, p), Q6 (a, c, e, g, i, k), Q7 (a, c, e, g, i, k), Q8 (a, c, f, h), Q9 (a, c, f, h), Q10
- 5 ÷ - 10 = - 5
- 10
= 1
2
3 = 3 x 3
2
-3 = -3 x -3
2
= 9
Order of Operations
Deal with the
brackets
first
Deal with
X
and
÷
(left to right)
Then,
+
and
-
last (left to right)
Examples
5 + 2 x (-3)= 5 + (-6)
= -1
Do the x first, before +

Examples
-6 + 2 x (-3)= 5 + (-6)
= -2
Do the x first, before +

- 6 ÷ 18
= - 6
18
=
2 =
2
-2 =
2
=
Number Planes
Point on a plane has a x and a y coordinate (x, y)

The x coordinate is written before the y coordinate.
Number Planes
Text (376)
Q1, 3, 4 (a, b [i, iii, v, vii]
Q6, Q7
BIDMAS
Full transcript