Maths tip: Michelle had four times as many stickers as Vanessa. After each of them bought an equal number of stickers from the bookshop, Michelle had thrice as many stickers as Vanessa. If Vanessa had 57 stickers in the end how many stickers did each of them buy from the bookshop?
Maths tip: The figure below consists of two semi circles with diameter 12cm and a sector of a circle with radius 12cm. Find the area of the shaded part, rounding your answer to the nearest whole number. Answer will come in the comment box.
Science tip: Another question from a reader. This is a Crookes radiometer. It is not in syllabus but the student is expected to be able to infer from the description and diagram. ( https://en.wikipedia.org/wiki/Crookes_radiometer ) The answers are: (a) chemical energy (from inside the batteries) -> electrical energy (the electricity) -> light energy (from the[…]
Good question from one of our readers. Question: The shaded region is bounded by an equilateral triangle and 2 quarter arcs. Find the area of the shaded part, rounding off your answer to the nearest whole number. Answer’s way below
Science tip: "Force" and "Energy" mean different things. Force is a push or a pull on an object, and can cause an object to change its momentum (different direction or speed). Energy is the capacity to do work. Energy has a few forms in the syllabus – electrical, gravitational potential, kinetic chemical, light, heat, sound.[…]
Science tip: It’s a common misconception that the white mist coming out of a kettle is steam. This has appeared in the PSLE a few times. We commonly call the white mist steam – and most people will agree on that term. In science, however, steam is considered to be the hot water vapour released[…]
Maths tip: Maths questions can be pretty tricky too. Remember to check your work! Here is an example. Give it a go!
Science tip: Words like "populations", "community", "consumers" and "producers" are specific scientific terms in biology and PSLE Science. Although we don’t use these terms if we’re not an ecologist, it is important to learn these in order to ace your Science exam. Population: a group of plants and animals of the same kind, living and[…]
Science tip: qn: "my gal asked if evaporation will be faster with wind. I answered "Yes" but am stuck when we have to explain why?" ans: When water evaporates, the water molecules are released into the air. Water molecules can also go back from the air into the water. When humidity is at 100%, the[…]
Science tip: Qn: "A test-tube filled with some water is placed in a beaker containing some ice. If salt is added to the ice, the water in the test-tube will freeze. But I thought salt will lower the freezing point of water and hence the ice in the beaker will melt? Isn’t that the reason[…]