April 12, 2022
Answers for the rest of the questions
https://drive.google.com/file/d/1PMzSKYSEhKkuTDmYgEyqH85TPtBEZa_3/view?usp=sharing
There are 25 prime numbers from 1 to 100. Learn them
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
Prime factor 168
168 = 2 x 2 x 2 x 3 x 7
12) Mean (average): add up all the data and then divide by how many numbers are there
Mode: most frequently occurred number
Median: middle number
e.g. find the mean, mode and median of the following
2, 5, 5, 12, 17, 18, 18, 20, 21
Mean: (2+5+5+12+17+18+18+20+ 21) = 118
118/9 = 13.11 (mean)
Mode: 5, 18 (both 5 and 18 occurs twice)
Median: 17
What if I have this set of numbers? (only eight numbers here)
2, 5, 5, 12, 17, 18, 20, 21
Median is somewhere between 12 and 17. Find the average of 12 and 17
(12+17)/2 = 29/2 = 14.5 (median)
14)
5 x n + 12 = 32
5 x n = 32 – 12
5 x n = 20
N = 20/5
N = 4
15) Area of parallelogram = height x base
(don’t need to use the length of the slanted side)
Area = 2 x 5 = 10
16) Triangular prism
Area for the rectangle is 5 x 10 = 50cm2
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Right angle triangle
Area of triangle
(6x4)/2 = 12
Missing areas: one rectangle to the left, one rectangle to the right and the triangle at the back
50 (right rectangle), 50 (left rectangle), 12 (triangle at back)
17)
12435 – 12375 = 60
There are four equal sections
60/4 = 15 per section
First dash mark 12375 + 15 = 12390
Second dash mark 12390 + 15 = 12405
Third dash mark 12405 + 15 = 12420
18) Match one sports event at a time to the graphing data
- eliminate D and B by only looking at the hockey data
- answer = C
19) Area of triangles : (base x height)/2
a. (6 x 2)/2 = 6
b. 3 x 3 = 9
c. 2 x 4 = 8
d. 6 x 2 = 12 answer = area of parallelogram
20) 1 million balloons
100 balloons per bag
1 million / 100 = 10000 bags of balloon
$2 x 10000 bags = $20000 answer
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