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P4 Math: Assumption Method

There are 30 questions in a Science contest. 
6 marks will be awarded for each correct answer.
4 marks will be deducted for each wrong answer.
All the questions must be answered.

If Sakinah scores 100 marks in the Science contest, how many questions does he answer correctly ?

Solution:

P6 Math: Supervisor and Worker

If 1 supervisor and 3 workers are working together they will complete a task in 4 days.

If 2 supervisors and 1 worker are working together they will take 3 days to complete the task. How long will it take to complete the task if 1 worker is to work alone on the task ?

Solution

P4 Math: Rectangles and Square

The figure below is made up of Rectangle P, Rectangle Q, Rectangle R, and Square S. The perimeter of rectangle Q is 40 cm. The perimeter of the figure is 72 cm.

(a) Find the length of AB.

(b) Find the area of Square S.

P4 Math: Five identical rectangles

The figure below is made up of 5 identical rectangles. The perimeter of each rectangle is 48 cm. Find the length of AD.