This is the second page of ' very difficult ' subtraction questions for year 4, that needs to be answered by using mental arithmetic methods, although many adults would struggle to achieve the correct answers: they are really very difficult!
Once again shows that there are different ways to set up each question; the key is to choose a method that efficiently and quickly. For example, they can be performed by counting, but this is also possible the quickest way and it's speed and accuracy that we are looking for.
It is also always a really good idea to check answers by performing the inverse operation; in this case would complement the answer and smallest number the largest number.
This, and other similar pages can be found in our year 4 calculations category even if the section four lines.
Very difficult mental arithmetic: subtraction_ (2)
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