Mental Subtraction Skills

Subtract multiples of ten thousand by counting back.

Adding and subtracting numbers that cross the thousands boundary: often ?counting on? is the best method.

Subtract multiples of one hundred by counting back.

Subtract multiples of one thousand by counting back.

Helping to decide whether it is best to work out the answer in your head or on paper.

Subtracting thousands mentally.

Subtracting hundreds or thousands mentally.