Here are some great Maths websites to play over the holidays!

Multiplication and division:
http://www.bbc.co.uk/bitesize/ks1/maths/multiplication/play/
http://freerice.com/#/multiplication-table/17508

Addition and subtraction:
http://www.bbc.co.uk/bitesize/ks1/maths/addition_and_subtraction/play/
http://www.oswego.org/ocsd-web/games/SpeedGrid/Addition/urikares.html
http://freerice.com/#/basic-math-pre-algebra/16893

Fractions:
http://www.bbc.co.uk/bitesize/ks2/maths/number/fractions_basic/play/
http://www.softschools.com/math/fractions/games/