Mental addition and subtraction worksheet

Single worksheet - questions on mental addition and subtraction. No answers.
Questions involve adding or subtraction two 3-digit numbers in cases when it’s quicker to use a mental strategy than to use column addition and subtraction.

This worksheet was created to support this video by RebeccaTheMathsLady about mental addition and subtraction.

This worksheet was developed by Jeff Kutcher from Jeff’s Notebooks and he is kindly allowing it to be freeshared here. Thank you Jeff!

There is a link from the worksheet to another resource on Jeff’s TES site that will generate new worksheets on this topic (with and without answer sheets) but you need Adobe Acrobat Reader for that (which you don’t for this single worksheet).