Vertical Sums

Subtracting 1 Number
	These exercises teach the basic technique of solving an equation when that equation is set out vertically. This technique is very useful for subtracting numbers with multiple digits and is one of, if not the, easiest technique for solving subtraction equations.

Subtracting 2 Numbers
	These exercises teach a more advanced version of the technique of solving an equation when that equation is set out vertically. This technique is very useful for subtracting more than two numbers, all with multiple digits and is one of, if not the, easiest technique for solving subtraction equations.

Subtracting 3 Numbers
	These exercises teach a more advanced version of the technique of solving an equation when that equation is set out vertically. This technique is very useful for subtracting more than two numbers (as demonstrated if you try and solve these equations when they are set out horizontally), all with multiple digits and is one of, if not the, easiest technique for solving subtraction equations.