Six differentiated worksheets on adding 10 more or subtracting 10 less on any 2-digit or 3-digit number. Sheet A support children who may still need to use concrete resources when adding and taking away 10. Sheets B, C and D can be used alongside a 100 square for those that need it. Sheets E and F move onto adding 10 more or subtracting 10 less on any given 3-digit number.