38a
Using an algebraic formula both forwards and backwards
9n: Times table knowledge up to 10 and converting multiplication facts into division facts
11n: Recognising which operation is required for a word problem
17a: Evaluating the output of multi-step function machines
22a: Use inverse operations to find the input of function machines
27a: Substitute positive whole numbers into simple expressions or formulae and evaluate
28a: Using a two-step formula written in words both forwards and backwards
32a: Solve equations formally by using 1/2 inverse operations
Formula
Operation
Inverse
Solve
Substitute
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