Written Calculation comprises six Pupil Books, six Answer Books, a Teacher's Guide and a Teacher's Resource Book and uses methods recommended in the National Curriculum. Designed for use at Key Stage 2, each Pupil Book uses 18 carefully structured steps to guide the learner towards full mastery of each written method, supporting them in their national tests and other areas of the National Curriculum. Written Calculation also helps pupils develop confidence and fluency in their learning by practising and embedding place value, number facts and problem solving skills. The importance of estimating and checking answers is also emphasised. Written Calculation: Addition leads pupils through the necessary steps for mastering the column method of addition. Pupils beginning this book should have an understanding of the value of digits in two- and three-digit numbers, experience of adding and subtracting single-digit numbers and know their addition number bonds to 20.