It's much easier to add 10 to 25, then add the 4. Let’s take a look at subtraction now. Subtraction is where we know the whole and only one of the parts. So this question 12 – 5 ...

Download the Addition & Subtraction lyric sheet so your class can sing along with the Geordie Pigeon. This Bitesize Primary animation explains additional methods for mental maths. KS2 Maths ...