Maths (Foundation)

Functions (Edexcel IGCSE Maths): Exam Questions

4 questions · 17 marks · ≈ 17 min

Guided practice

15 marksmedium

1 mark

(a)

Here is a number machine.

Flowchart with an input processed through three steps: multiply by 5, subtract 7, and divide by 2, leading to an output.

Work out the output when the input is 15

Your answer

2 marks

(b)

Work out the input when the output is 124

Your answer

2 marks

(c)

The input is $p$ . The output is $T$

Write down a formula for $T$ in terms of $p$ .

Your answer

How did you do?/ 5

23 marksmedium

1 mark

(a)

Here is a number machine.

Flowchart showing a process: input multiplied by 10, resulting value increased by 6, leading to output.

Work out the output when the input is 14

Your answer

2 marks

(b)

Here is a different number machine

Flowchart with two processes: first multiplies input by a number, second adds 9, resulting in the output. Arrows indicate progression.

When the input is 11 the output is 64

Write a number on the dotted line to complete the number machine.

Your answer

How did you do?/ 3

34 marksmedium

2 marks

(a)

Here is a number machine.

Flowchart diagram showing input processed through multiplication by y, then subtraction of 17, leading to output.

When the input is 7 the output is 60

Work out the value of $y$

Your answer

2 marks

(b)

Here is a different number machine.

Flowchart diagram showing a process where input is increased by 7, then divided by 5, leading to the output.

The input is $x$

Write down an expression, in terms of $x$ , for the output.

Your answer

How did you do?/ 4

45 marksmedium

1 mark

Here is a number machine.

Function machine with operations: input multiplied by 3, subtract 9, then divide by 10, leading to output. Each step is shown in outlined shapes.

Work out the output when the input is 14

Your answer

2 marks

Work out the input when the output is 21

Your answer

2 marks

The input is $a$ . The output is $B$ . Write down a formula for $B$ in terms of $a$ .

Your answer

How did you do?/ 5