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Larger divisions with remainders
In-depth Investigation: The Remainders Game from nrich.maths.org
+/- 1-digit numbers to/from big numbers
In-depth Investigation: Amy's Dominoes from nrich.maths.org
Mentally add/subtract near multiples
In-depth Investigation: Twenty Divided into Six from nrich.maths.org
Mental subtraction incl. counting up
In-depth Investigation: Which is Quicker? from nrich.maths.org
Multiplication and division facts
In-depth Investigation: Function Machines from nrich.maths.org