subitiseSUBfacts

sample Q from each layer	teach-learn questions
layer	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
practise-learn worksheets
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NC information

N2 apply the four operations, including formal written methods, to integers, decimals and simple fractions (proper and improper), and mixed numbers – all both positive and negative;