Number - addition and subtraction

• add and subtract numbers mentally, including:

·       a three-digit number and 1s

·       a three-digit number and 10s

·       a three-digit number and 100s

• add and subtract numbers with up to 3 digits, using formal written methods of columnar addition and subtraction

• estimate the answer to a calculation and use inverse operations to check answers   

• solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction