Mentally add two 3 digit multiples of 10, without bridging the hundred.
Add/ subtract units or multiples of 10,100 or 1000 from four/five digit number with and without bridging e.g. 2867 – 200 + 2.
Mentally find the difference between two 3 digit numbers which are close.
Mentally multiply any whole number by 10, answers within 99999.
Multiply any whole number by 100, answers within 99999.
Multiply any whole number by 100, answers within 99999, using the concept that digits move two places to the left, as the value of each digit becomes 100 times larger.
Mentally divide any multiple of 10, within 99999, by 10.