Number Ninjas
18×25
450
Find the complement of 27°
63°
Name the triangle with side lengths:
6 cm, 6 cm, 9 cm.
Isosceles
3x+8=26
x=6
52+33
25 + 27 = 52
Two supplementary angles differ by 24°.
Find both angles.
Let the angles be x and x+24
x+x+24=180
2x=156
x=78
Angles are
78° and 102°
Which measure of centre is usually closest to the long tail in a positively skewed graph?
A) Mode
B) Median
C) Mean
Mean
A jumper costs $120.
It is discounted by 15%.
How much is the discount?
15% of 120
= $18
A number is divisible by both 6 and 9. Name the smallest possible positive number.
18
An angle at a point is made up of:
95°, 68°, x° and 104°.
Find x.
95+68+104=267
360−267=93°
Name the quadrilateral.
Rectangle
A class of 25 students was surveyed.
16 students preferred basketball.
What percentage preferred basketball?
16÷25×100
= 64%
−42+32
Remember powers before negatives.
−42=−(42)=−16
32=9
−16+9=−7
Two parallel lines are cut by a transversal.
One angle measures 124°.
Find:
Corresponding = 124°
Alternate = 124°
Co-interior = 56°
Which quadrilateral has
but does not have to contain right angles?
Rhombus
A rectangle has an area of 96 cm².
Its width is 8 cm.
Find its perimeter.
Length
96÷8=12
Perimeter
2(12+8)
= 40 cm
(−3)3+42
(−3)3=−27
42=16
−27+16=−11
Two parallel lines are cut by a transversal.
One angle is 68°.
Another angle x is vertically opposite to the corresponding angle.
Find x.
Corresponding = 68°
Vertically opposite = 68°
Answer: 68°
triangle has angles
48°, 48° and 84°.
Classify it by:
Sides:
Isosceles
Angles:
Acute
A tank contains 240 L of water.
Every minute 18 L is removed.
How much water remains after 7 minutes?
18 × 7 = 126
240 −126
= 114 L