Maths tip: I came across this interesting question. So interesting that I had to find different ways to solve it. 🙂 Have a go, let me know if you’ve discovered other ways! "Mr Lim left Town A for Town Bwhile Mr Tan left Town B for Town A. Both men left at the same time.[…]
Science tip: There will be a question or two about the digestive system. Here are the key points: – Digestive juices are produced in the mouth, the stomach, and the small intestine. – Mouth – main role is to chew / churn and secrete digestive juice (saliva). – Stomach – main role is to digest[…]
Maths tip: "Double-if" type questions appear frequently. Here’s another example, solved with three methods. Students are free to pick the method they prefer! Maths tip: Here are three double-if questions to try. Can be solved with the three methods I posted earlier. Let me know if you need any help! Jack and Aqil had some[…]
Science tip: Stomata allows gaseous exchange between the plant and the atmosphere. It allows in carbon dioxide and oxygen for photosynthesis and respiration respectively. Carbon dioxide produced during respiration can also escape through these pores; similarly, oxygen produced during photosynthesis also escape. Water vapour always leaves through the stomata. Usually, stomata will shut during the[…]
Maths tip: Scenario type questions, sometimes also called "Double-if" questions, are common in the last section of the Maths paper. An example is "Andy and Bob each had a certain amount of money. If Bob gave Andy $40, Andy would have twice as much as Bob. If Andy gave Bob $40, Bob will have thrice[…]
Science tip: The north end of magnets are so called because, freely suspended, they point towards the Earth’s North Pole. The north pole of a compass needle (usually coloured red or black) also points towards the Earth’s North Pole. Since opposite poles attract, the north pole of a compass needle is attracted to a magnet’s[…]
Science fact: Red blood cells in humans do not have a nucleus, as such they cannot carry out cell division. Red blood cells develop in bone marrow and circulate in the body for around 120 days. They contain haemoglobin which helps transport oxygen around the body. The iron in haemoglobin combines with oxygen to give[…]
Maths tip: Read the question carefully. In this question, 50% of water left in the tank is not 50ml but rather 60ml.
Science tip: Evaporation of water absorbs heat energy from the surroundings. The full explanation is out of syllabus but for those interested, you can read up on latent heat and enthalpy of vaporization. Similarly, melting of ice also absorbs heat energy. From past year’s PSLE: Some buildings use a cooling mist system 2 lower the[…]
Maths tip: Some rate questions asks for combined rate. For these, first determine the rate, and then add them together. Example: "Lionel would take 8 days to build a wall. For the same wall, Nick would take 6 days. How many days would be needed to build the same wall if both of them worked[…]