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**(KS1 > Mathematics (National Curriculum) > Number > Calculations) :-**1. understand addition and use related vocabulary; recognise that addition can be done in any order; understand subtraction as both 'take away' and 'difference' and use the related vocabulary; recognise that subtraction is the inverse of addition; give the subtraction corresponding to an addition and vice versa; use the symbol '=' to represent equality; solve simple missing number problems [for example, 6 = 2 + ? ] View games for this curriculum aim**(KS1 > Mathematics (National Curriculum) > Number > Calculations) :-**3. develop rapid recall of number facts: know addition and subtraction facts to 10 and use these to derive facts with totals to 20, know multiplication facts for the x2 and x10 multiplication tables and derive corresponding division facts, know doubles of numbers to 10 and halves of even numbers to 20 View games for this curriculum aim**(KS1 > Mathematics (National Curriculum) > Number > Calculations) :-**4. develop a range of mental methods for finding, from known facts, those that they cannot recall, including adding 10 to any single-digit number, then adding and subtracting a multiple of 10 to or from a two-digit number; develop a variety of methods for adding and subtracting, including making use of the facts that addition can be done in any order and that subtraction is the inverse of addition View games for this curriculum aim**(KS1 > Mathematics (National Curriculum) > Number > Calculations) :-**5. carry out simple calculations of the form 40 + 30 = ?, 40 + ? = 100, 56 - ? = 10; record calculations in a number sentence, using the symbols +, -, x , รท and = correctly [for example, 7 + 2 = 9] . View games for this curriculum aim