Question 1
Subtract three times the smallest number from twice the largest numbers in the list.
5, 12, 9, 3, 8, 13
Solution:
The smallest number in the list is 3.
The largest number in the list is 13.
Twice the largest number = 2 x 13 = 26
Three times the smallest number = 3 x 3 = 9
Subtract three times the smallest number from twice the largest number = 26 – 9 = 17
Therefore, the answer is 17.
Question 2
What is 486 minutes in hours and minutes?
Solution:
1 hour = 60 minutes
486 minutes = 486/60 hours = 8 hours and 6 minutes
Therefore, 486 minutes is 8 hours and 6 minutes.
Question 3
Find the missing numbers.
4.39 × ________ = 439000
Solution:
4.39 × ________ = 439000
To find the missing number, let the number be x.
4.39 × x = 439000
x = 439000/4.39 = 100000
Therefore, the missing number is 100000 or 10^5.
Question 4
There 360 boys and 120 girls at a primary school. During the holidays 50% of the boys and 40% of the girls saw the Harry and Potter movie.
How many pupils in total from the primary school saw the movie?
Solution:
50% of 360 boys = (50*360)/100 = 180
40% of 120 girls = (40*120)/100 = 48
Total number of pupils who saw the movie = 180 + 48 = 228
Therefore, 228 pupils from the primary school saw the movie.
Question 5
A piece of wire 48cm long is bent into the shape of a rectangle. If the rectangle is twice as long as it wide, What is the area (in square centimetres)?
Solution:
Let the width of the rectangle be x cm.
Then, the length of the rectangle = 2x cm.
Perimeter of the rectangle = 2(2x + x) = 48
2(3x) = 48
6x = 48
x = 48/6 = 8
Width of the rectangle = 8 cm
Length of the rectangle = 2 x 8 = 16 cm
Area of the rectangle = 8 x 16 = 128 cm^2
Therefore, the area of the rectangle is 128 cm^2.
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