math test revision
Authored by Yoyo Bar
Mathematics
9th Grade
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13 questions
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1.
FILL IN THE BLANK QUESTION
15 mins • 1 pt
Answer explanation
[z + 11 = 35 - 5z]
-z -z
[11 = 35 - 6z]
-35 -35
[-24 = -6z]
÷-6 ÷-6
[4 = z]
OR
[z + 11 = 35 - 5z]
+5z +5z
[6z + 11 = 35]
-11 -11
[6z = 24]
÷6 ÷6
[z = 4]
2.
FILL IN THE BLANK QUESTION
15 mins • 1 pt
4.2 simultaneous equations
-
solve these simultaneous equations
6x + 7y = 49
3x - 7y = 14
write your answer like this (without speech marks and without stuff in brackets)
“(what x is),(what y is)”
for e.g
“4,9”
Answer explanation
(A) 6x + 7y = 49
(B) 3x - 7y = 14
A + B
9x = 63
÷9 ÷9
x = 7
SUBS
6x + 7y = 49
substitute x
6(7) + 7y = 49
simplify
42 + 7y = 49
-42 -42
7y = 7
÷7 ÷7
y = 1
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
4.3 inequalities
-
Length AB is shorter than length AC
write an inequality to show this and solve it
x < 18
x > 4
x > 18
x < 4
Answer explanation
3x - 7 < 4x - 11
+7 +7
3x < 4x - 4
-4x -4x
-x < -4
÷-1 ÷-1
x > 4
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
5.1 calculating angles
-
work out the value of x
120
105
65
140
Answer explanation
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
5.2 Interior angles in polygons
-
What does x equal to?
145
125
290
100
Answer explanation
720 - (150+130+150+90) = 2x
720 - 520 = 2x
200 = 2x
100 = x
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
5.3 Exterior angles of polygons
-
This is a challenging question but you can do it!
A
B
C
D
Answer explanation
32+8x+6+180−(10x+16)=180
Simplify both sides of the equation.
32+8x+6+180−(10x+16)=180
32+8x+6+180+−10x+−16=180
(8x+−10x)+(32+6+180+−16)=180
(Combine Like Terms)
−2x+202=180
−2x+202=180
Subtract 202 from both sides.
−2x+202−202=180−202
−2x=−22
Divide both sides by -2.
−2x−2=−22−2
x=11
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
5.5 Pythagoras’ theorem and
7.1 area/circumference of a circle
-
What is the perimeter of this shape?
round the answer to a whole centimeter
(You Are Allowed A Calculator)
43
37
47
35
Answer explanation
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