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Year 9

Using the fx-CG50 for number and algebra

I can use the fx-CG50 to perform calculations with numbers and solve equations numerically.

Download all resources
Share activities with pupils
New
New
Year 9

Using the fx-CG50 for number and algebra

I can use the fx-CG50 to perform calculations with numbers and solve equations numerically.

Download all resources
Share activities with pupils

These resources will be removed by end of Summer Term 2025.

Switch to our new teaching resources now - designed by teachers and leading subject experts, and tested in classrooms.

These resources were created for remote use during the pandemic and are not designed for classroom teaching.

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Lesson details

Key learning points

  1. Some calculators can perform more than just basic calculations.
  2. The fx-CG50 can solve equations graphically and numerically.

Keywords

  • Equation - An equation is used to show 2 expressions that are equal to each other.

  • Simultaneous equations - Equations which represent different relationships between the same variables are called simultaneous equations.

Common misconception

Calculators can only be used to add, subtract, multiply or divide.

They can be used to perform basic calculations but they can also do so much more.


To help you plan your year 9 maths lesson on: Using the fx-CG50 for number and algebra, download all teaching resources for free and adapt to suit your pupils' needs...

For more support with using the Casio fx-CG50, please visit the Casio website where there are more free resources to support use of this model.
Teacher tip

Equipment

Casio fx-CG50

Licence

This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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Starter quiz

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6 Questions

Q1.
An is used to show 2 expressions that are equal to each other.
Correct Answer: equation
Q2.
Equations which represent different relationships between the same variables are called equations.
Correct Answer: simultaneous
Q3.
A is an equation, graph, or sequence whereby the highest exponent of the variable is 2.
Correct Answer: quadratic
Q4.
Equations can only be solved numerically.
True - you have to rearrange to make the variable the subject.
True - you have to factorise to solve.
False - equations can only be solved by guessing.
Correct answer: False - equations can be solved graphically.
Q5.
Solve to find the value for $$a$$ that satisfies $$2a + 7 = 1$$
Correct Answer: -3
Q6.
Solve to find the values of $$x$$ that satisfy the equation $$4x^2 + 20x + 21 = 0$$
Correct answer: $$\frac{-3}{2}$$
$$\frac{-5}{2}$$
Correct answer: $$\frac{-7}{2}$$
$$\frac{-3}{4}$$
$$\frac{-5}{4}$$

Exit quiz

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6 Questions

Q1.
Use your calculator to solve $$a^2 - 12a + 11 = 0$$
Correct answer: $$a = 1$$ , $$a = 11$$
$$a = 3$$ , $$a = 4$$
$$a = -1$$ , $$a = -11$$
$$a = -3$$ , $$a = -4$$
Q2.
Use your calculator to solve $$x^2 + 6x + 8 = 3$$
Correct answer: $$x = -1$$ , $$x = -5$$
$$x = -1$$ , $$x = 5$$
$$x = 1$$ , $$x = -5$$
$$x = 1$$ , $$x = 5$$
Q3.
Use your calculator to solve $$x^2 + 12x - 15 = 4x + 5$$
$$x = -2$$ , $$x = -10$$
$$x = -2$$ , $$x = 10$$
Correct answer: $$x = 2$$ , $$x = -10$$
$$x = 2$$ , $$x = 10$$
Q4.
For the formula $$v = u + at$$, what is the value of $$a$$ when $$v = 20, u = 4$$ and $$t = 4$$?
Correct Answer: 4
Q5.
For the formula $$Q = \frac{f}{s - v}$$, what is the value of $$s$$ when $$v = 5, f = 16\;000$$ and $$Q = 45\;000$$? Give your answer to 2 d.p.
Correct Answer: 5.36
Q6.
For the formula $$A = 2\pi r^2 + 2\pi rh$$, what is the value of $$r$$ when $$A = 756$$ and $$h = 22$$? Give your answer to 2 d.p.
Correct Answer: 4.53