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Year 4 of the National Curriculum :
Add and subtract numbers with up to 4 digits using the formal written methods of columnar addition and subtraction where appropriate.

As you will see in the description of each resource differentiation is a major feature allowing you to pick and choose the level of practice suitable for all your students starting with addition and subtraction of 2-digit numbers without regrouping going all the way through to adding four 4-digit numbers.

Because (at the click of a button) you can randomize the numbers on every worksheet, a student can repeat a level of worksheet more than once, so that they build confidence , step by step, over whatever time period is needed.