PSLE Word Problem - Solution

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Information about PSLE Word Problem - Solution
Education

Published on February 19, 2014

Author: samthomson1213

Source: slideshare.net

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PSLE features this type of questions that focuses on problem solving. These questions separate students who scores the As. The question is easier to solve when visualised in bar model form.

Seriously Addictive Maths is enrich your child's learning in Singapore Maths. We incorporates word problems into our curriculum starting from kindergarten level all the way to Primary 6.

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell?

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? 1 Draw 2 model bars representing each colour pen, break the longer at the point it is equal to the shorter bar Yellow Pens Equal Blue Pens 185 More Yellow Pens

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? 2 Now divide the bars into smaller parts to represent the fractions. The common denominator for 3/5 and 1/2 is 10, so we’ll use 10 parts. For the extra 50 yellow pens, we’ll leave it as 5 parts Yellow Pens 50 More Blue Pens

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? 3 We know 3/5 yellow pens were sold. For both left and right yellow bars, we will indicate 3/5 of pens were sold in white. Likewise, we know 1/2 blue pens were sold, which we can also indicate in white. Yellow Pens 50 More Blue Pens

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? 4 We know 3/5 of yellow pens were sold, thus we can determine how many of the 50 extra yellow pens were sold and how many left Yellow Pens 50 More Blue Pens 3/5 X 50 
 =30 sold ! 2/5 X 50 = 20 left

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? 5 Now let’s focus on the left hand side. Of the 110 pens left, 20 are the extra yellow pens (orange). So the remaining 110 - 20 = 90 are yellow and blue pens. Yellow Pens 50 More 3/5 X 50 
 =30 sold ! 2/5 X 50 = 20 left Blue Pens + = 110 - 20 = 90 pens

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? 6 4 yellow units + 5 blue units = 90 pens. Thus each unit represents 
 90 / (4+5) = 10 pens Yellow Pens 50 More 3/5 X 50 
 =30 sold ! 2/5 X 50 = 20 left Blue Pens + 4 Units 5 Units 9 units = 90 pens 1 unit = 90/9 = 10 pens

Steve made 50 more yellow pens than blue pens. After selling 3/5 of the yellow pens and 1/2 of the blue pens, he had 110 pens left. How many pens did he sell? Answer : 110 + 30 = 140 Sold 185 More 7 3/5 X 50 
 =30 sold ! 2/5 X 50 = 20 left Yellow Pens Blue Pens + 4 Units 5 Units There were 11 units sold, 
 thus 11 units X 10 pens per unit = 110 pens

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