Grade 4 Flashcards
8^4 x 8^3
131
8^7
POWERS ADD TOGETHER
3^10 / 3^3
131
3^7
POWERS MINUS
(K^8)^2
131
K^16
POWERS MULTIPLY
(2xy)^2
131
4 x^2 y^2
(2 x^2 y^3) ^3
131
8 x^6 y^9
2x x 3y
131
6xy
Find the midpoint of A (-4,-2) and B (2,0)
133
Find the midpoint of the X axis -> -1
Find the midpoint of the Y axis -> -1
Answer (-1,-1)
The midpoint of A and B is at (3.5, 2.5)
The coordinates of A are (2, 5)
Work out the coordinates of B
(133)
Find the difference in X and midpoint -> 1.5
Find the difference in Y and midpoint -> -2.5
Add the differences to the midpoint -> (5,0)
A silver necklace weighs 123g to the nearest gram, what is the lower and upper bounds?
(132)
122.5g
A door is 125 cm to the nearest 5cm, what are the lower and upper bounds?
(132)
122.5g
A square has sides of length 7 cm, correct to the nearest centimetre.
Calculate the lower bound for the perimeter of the square.
Calculate the upper bound for the area of the square.
(132)
Perimeter = 6.5 x 4 = 26
Area = 7.5 x 7.5 = 56.25 ( less than or equal to 56.24 cm^2)
2(x + y) + 3(x – y)
134
2x + 2y + 3x -3y
5x -y
4(x^2 + 2y^2)
134
4x^2 + 8y^2
2y^2 (3y^2 + 4y)
134
6y^4 + 8y^3
(4x – 6)(2x + 1)
134
8 x^2 -8x -6
(3x – 2y)(x – 5y)
134
3x^2 -17xy +10 y^2
Solve
5(x + 3) = 2(x + 6)
(135)
EXPAND -> 5x + 15 = 2x + 12
3x=-3
x= -1
4x + 3 / 5 = 2x – 1 / 2
135
Multiply out the bottoms
2 ( 4x + 3) = 5 ( 2x -1 )
Expand
8x + 6 = 10x -5
Solve
2x = 11
x = 5.5
Make c the subject
a = b + cd
(136)
a-b =cd
a-b / d = c
Make x the subject
y = 0.5 x + 2
(136)
2y = x + 4
2y - 4 = x
The sides of a rectangle are x+5 and x , give a formula for the perimeter
(137)
x + 5 + x + 5 +5 + 5
2x +20
The perimeter of a rectangle is 38cm
It has sides of x + 5 and 5
What is x?
(137)
2x + 20 = 38
2x = 18 x = 9
140 Simultaneous equations graphically
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138 inequalities on a number line
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