Examples of what pupils should know and be able to do
Understand that the letter stands for an unknown number or variable number and not a label, e.g. '5a' cannot mean '5 apples' but that if a is the cost of an apple then 5a means the cost of 5 apples.
Probing questions
How do you know whether a letter symbol represents an unknown number or variable quantity and not a label?
What if pupils find this a barrier?
Devise expressions and write them onto cards.
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