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My students always tell me, “Mr Jimmy, this type of questions again!! It always come out in my exams and I always don’t know how to do!” Step 5: Find the total cost of the extra pensġ/2 × 78u = 39u (Total cost of extra pens) Step 4: Find the total amount of money in terms of units Step 3: Find the total cost of 5 pens and 11 erasersĥ × 3u + 11 × u = 26u (Total cost of 5 pens and 11 erasers) Step 2: Find the fraction spent on the extra pensģ/4 × 2/3 = 1/2 (Fraction spent on extra pens) Step 1: Write down the ratio of the cost of pen : eraser She bought some more pens with 3/4 of her remaining money. The cost of each pen is 3 times the cost of each eraser. Kelly spent 1/3 of her money on 5 pens and 11 erasers. This is another common type of PSLE Math questions which you need to be clear on the relationship between the “part” and the “whole”. Step 3: Cross multiply the final units with the final ratio Step 2: Compare the final units with the final ratio. Step 1: Write down the starting ratio and apply the changes. After Ali saved another $60 and Billy spent $150, the ratio became 4 : 1. The ratio of Ali’s money to Billy’s money was 2 : 1. I recommend “Units and Parts” to solve this type of questions. Both sides of the ratio changed by different amounts. This is a more challenging type of PSLE Math questions. Step 2: Find the difference between Ali’s starting age and final ageĥ. Everything Changed Concept (Units and Parts) Step 1: Make the difference for Ali and Billy the same In 3 years’ time, their ages will be in the ratio of 3 : 5. The ages of Ali and Billy are in the ratio of 4 : 7. Step 2: Find the difference between Ali’s starting amount and ending amountįor questions relating to age, the age difference between 2 people will always remain the same. Step 1: Make the total for Ali and Billy to be the same How much money does Billy have in the end? After Ali gave Billy $20, they have an equal amount of money. You can apply this concept when you see this type of PSLE Math questions.Īli and Billy have money in the ratio of 5 : 4.
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Under questions which involve “Internal Transfer”, the total remains the same. Step 4: Find the amount for Billy in the end Step 2: Find the difference between Billy’s starting amount and ending amount After Billy spent $16, the ratio became 3 : 2. You need to identify the part which remain constant and make them equal in both ratios.Īli and Billy have money in the ratio of 5 : 6. The word “Constant” means remain the same. The next type of common PSLE Math questions is on Constant Part Concept which is commonly tested in Ratio questions. After James lost 1/5 of his marbles and Dan lost 3/4 of his marbles, James had 184 more marbles than Dan. Watch the video below to learn how to cut models to compare them easily. I recommend you to use this method when you see the word “more than”, “less than” or “as many as” in Whole Number or Fractions questions. Model drawingis used extensively in Singapore Math. Step 8: Find the girls who do not take bus Step 5: Find the total number of units and equate it to the total boys and girls Step 2: Compare the boys and girls who do not take busģ/10 of boys = 2 × 1/8 of girls (The number of boys who do not take bus is twice the number of girls who do not take bus) Step 1: Find the fractions of boys and girls who do not take bus The number of boys who do not take bus is twice the number of girls who do not take bus. 7/10 of the boys and 7/8 of the girls take bus to school. In this concept, you basically need to make the numerator the same and compare the denominator. I have seen this concept being tested so many times in PSLE Math and yet, so many students failed to identify or apply the concept correctly. If John had $16 left, how much did he have at first?įraction of Money Left = 2/3 × 2/5 = 4/15 John spent 3/5 of his money on books and 1/3 of the remainder on a wallet. You will learn more about branching in the example below. When you see the keyword “remainder”, I recommend you to use this method called “Branching” or “Model Drawing” method. This is usually tested in Fractions and Percentage questions for PSLE Math. The first type of common PSLE Math questions is on remainder concept. Click the download button below to download.
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Make sure you Bookmark this page as I will be updating this page with more types of PSLE Math questions.īefore you forget, download our PSLE Math Mind-Maps for free (for a limited time only). This page contains all the common types of PSLE Math questions and how to solve them.