Lines of symmetry, co-ordinates, angle, finding change from £5 or £10 and mental arithmetic are all part of this week's work.

Week 17 covers ordering numbers, perimeter, addition, estimating subtraction as well as plenty of mental arithmetic.

Counting in steps of 25, negative numbers, the 11x table and division all form a part of Week 19.

Week 20 takes a look at equivalent fractions, subtracting fractions, mental arithmetic and much more.