Variables and equations
The rule of this machine is ‘half the number’ What number was fed into the machine each time?
5
16
1 2
4
50
Riana has a function machine. The rule is ‘add five’.
a
a + 5
The letter a stands for a number. It is a variable.
1 Clara’s function machine gives the number 8
8
She writes an equation to help her find out what number was put in. a + 5 = 8 The number 3 must have been fed into the function machine.
208
9781380050717__text.indb 208
28/04/2022 12:13
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