**PSLE 2023 Math Questions – Grouping and Model Drawing**

The main aim of this math revision note is to go through challenging PSLE 2023 Math questions on Grouping and Model Drawing.

This will help your child become better at solving similar questions in the future.

These questions evaluate your child’s proficiency in recognizing items in sets, employing logic, and visualising model components to solve them.

**Before you read on, you might want to download this entire revision notes in PDF format to print it out for your child, or to read it later.**

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__PSLE 2023 Math Question – Grouping __

*There is a special offer. For every 10 eggs bought, 2 eggs will be given for free. In the end, someone brought home 120 eggs. She saved $4.80 during the special sale. How much do 10 eggs cost?*

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__Solutions__

Since we are given 2 eggs free for every 10 eggs, we can use the Grouping concept to find the number of eggs in 1 set.

1 set = 10 + 2 = 12 eggs

Number of sets = 120 eggs ÷ 12 eggs = 10 sets

Number of free eggs = 10 sets x 2 free eggs = 20 free eggs

20 free eggs = $4.80 saved

With 20 free eggs, $4.80 is saved.

If the 20 eggs are not free, $4.80 will need to be spent for the 20 eggs.

Cost of 20 eggs = $4.80

Cost of 10 eggs = $4.80 × 2

= $2.40 (Ans)

__PSLE 2023 Math Question – Model Drawing__

*Gopal has 3 identical tins of paint which are all full. He removed 760 ml of paint from each tin. The sum of the remaining amount of paint in each tin is equal to the amount of paint in 1 tin. How much paint is there in 1 tin?*

__Solutions__

To visualise the relationship, we can draw models below to show the amount of paint in 1 tin.

Since the sum of the remaining amount is equal to the amount of paint in 1 tin, we can rotate the horizontal 1 tin bar model to a vertical bar model to fit it into the remaining parts.

Thus, 1 tin can be cut into 3 equal parts.

Each part represents the remaining amount of each tin.

Remaining amount of each tin = ^{1}⁄_{3} of a tin

Hence, the amount used in each tin is ^{2}⁄_{3} of the tin.

^{2}⁄_{3} of a tin = 760 ml

^{1}⁄_{3} of a tin = 760 ml 2 = 380 ml

^{3}⁄_{3} of a tin = 380 ml x 3 = 1140 ml

**Before you go, you might want to download this entire revision notes in PDF format to print it out for your child, or to read it later.**

**This will be delivered to your email inbox.**

To Your Child’s Success,

Ms Nelly Ke

Math Specialist

Jimmy Maths and Grade Solution Learning Centre

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