Year 6 Subtraction - This is a really effective trick that can be applied in all year groups. When faced with a question involving calculating change, for example I spend £7.78 and I pay with a £10 note, how much change do I receive, or 2000 - 1779, many children will immediately apply a column subtraction method. This works, but it involves a lot of exchanging which provides many opportunities to make a mistake. This bonus method provides a little trick to help make these style of calculations a LOT easier - Primary School Maths Operations - Subtraction Bonus Method - Parent, Teacher and Child support guide. • Year 6 Subtraction - Bonus Method - Primar... Help support your child with their maths learning and to achieve their end of year expectations.