How to Solve Simultaneous Equations using Model and Algebra

How to Solve Simultaneous Equations using Model and Algebra

It has been said that “If your child wants to score A star for PSLE Math, he must know how to solve Simultaneous Equations.”

Someone also told me that the ability to solve Simultaneous Equations is what differentiate the ‘A star’ students and ‘A’ students. To a certain extent, I think it is true. Most of the challenging problem sums in PSLE Math has 2 unknowns. To solve for 2 unknowns, you need to create 2 equations and solve them at the same time. That is we call them Simultaneous Equations.

Solving Simultaneous Equations is an important skill to solve challenging questions in PSLE Math papers. There are 2 methods Model and Algebra.

Model drawing is great for visual learners. As primary school students’ minds are still not trained to handle complex Algebra yet, model drawing maybe more appealing for them.

Nonetheless, Algebra is a must know skill as you will be learning how to use Algebra to solve more complicated equations in Secondary Schools. That is why I strongly encourage primary school students to pick up Algebra well.

I shall go through how to solve Simultaneous Equations using Model and Algebra. Watch the 2 videos below learn how.


Ahmad and Bernard had a total of  $240. Ahmad spent 2/3 of his money and Bernard spent 3/5 of his money. As a result, Bernard had $8 more than Ahmad. How much did they spend altogether?


Using Model to Solve Simultaneous Equations



Using Algebra to Solve Simultaneous Equations


After watching the videos, which method do you prefer?

Many students also ask me, “Which method is better?”

Either one is fine as long as you know how to apply it correctly. Marks will be awarded as long as your workings are logical. In fact, you may have other methods instead of Model and Algebra. 

These methods are covered more in depth in my online course. More details can be found below. 

8 Must Know Methods to Solve Problem Sums - Online Course

Don't go for exams with knowing these 8 methods! They are crucial!

8 Must Know Methods for PSLE Math

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