There are thousands of online games, activites and resources which can help reinforce ideas taught at school. Here are some links to websites which you may find useful at home:
Counting
http://www.abc.net.au/countusin/
http://www.ictgames.com/counting.htm
http://www.funbrain.com/count/index.html
http://www.oswego.org/ocsd-web/games/DogBone/gamebone.html
http://www.funbrain.com/guess/index.html
Number identification
http://www.funbrain.com/ofm/index.html
Basic facts
http://www.ictgames.com/doubles.htm
http://www.ictgames.com/bridgingThro.htm
http://www.aplusmath.com/Flashcards/addition.html
http://www.coolmath-games.com/1-number-games-01.html
http://www.primarygames.com/math.htm
http://sample.iboard.co.uk/player/frameset.htm?id=library-all/xw4EF3jp9UQ3Ne3sROlIS
Addition and subtraction
http://www.ictgames.com/addition.htm
http://www.ictgames.com/subtraction.htm
http://www.funbrain.com/football/index.html
http://www.funbrain.com/math/index.html
http://www.woodlands-junior.kent.sch.uk/maths/numberskills.html
http://www.mathsisfun.com/numbers/addition.html
http://www.mathsisfun.com/numbers/subtraction.html
http://www.funbrain.com/osa/index.html
http://www.learningmedia.co.nz/staticactivities/online_activities/alien_addition/
http://www.funbrain.com/algebra/index.html
http://www.arcademicskillbuilders.com/
http://tutpup.com/plays/new/1-maths-game
http://www.funbrain.com/fractop/index.html
Multiplication and division
http://www.ictgames.com/multiplication_rounding.htm
http://www.woodlands-junior.kent.sch.uk/maths/timestable/index.html
http://www.woodlands-junior.kent.sch.uk/maths/division.htm
http://www.mathsisfun.com/tables.html
http://tutpup.com/plays/new/4-times-tables-game
http://www.mathsisfun.com/numbers/division.html
http://www.funbrain.com/cracker/index.html
Decimals, fractions and percentages
http://www.ictgames.com/equivalencePage.htm
http://www.woodlands-junior.kent.sch.uk/maths/fractions/index.htm
http://www.mathsisfun.com/decimals-menu.html
http://www.mathsisfun.com/percentage-menu.html
http://www.funbrain.com/fract/index.html
http://www.mathsisfun.com/fractions-menu.html
Place value
http://www.ictgames.com/placeValue.htm
http://www.woodlands-junior.kent.sch.uk/maths/interactive/numbers.htm#Place
http://www.funbrain.com/tens/index.html
General
http://www.worldmathsday.com/2010/Default.aspx
http://www.amathsdictionaryforkids.com/
Phonics
http://teacher.scholastic.com/clifford1/flash/concentration/index.htm
http://teacher.scholastic.com/clifford1/flash/vowels/index.htm
http://teacher.scholastic.com/clifford1/flash/confusable/index.htm
http://teacher.scholastic.com/clifford1/flash/phonics/index.htm
http://www.bbc.co.uk/schools/ks1bitesize/literacy/phonics/index.shtml
Alphabet
http://www.roythezebra.com/reading-games-alphabetical-order.html
http://www.starfall.com/n/level-k/index/play.htm?f
http://www.primarygames.com/abc_fun/abc_fun.htm
http://www.alfy.com/teachers/teach/Thematic_Units/abc/abc1.asp
http://www.bbc.co.uk/schools/ks1bitesize/literacy/alphabet/index.shtml
http://www.mattelscrabble.com/en/kids/games/invaders.html
Basic sight words
http://www.kenttrustweb.org.uk/kentict/content/games/starwriter.html
http://www.kidsspell.com/
http://www.familylearning.org.uk/sight_word_games.html
http://www.funbrain.com/spell/index.html
http://www.mrcpl.org/literacy/lessons/sight/index.html
Spelling
http://www.mattelscrabble.com/en/kids/index.html
http://kidshealth.org/kid/closet/games/spelling_bee.html
http://www.primarygames.com/langarts/bouncingletters/start.htm
http://www.bbc.co.uk/schools/wordsandpictures/hfwords/starwords/gamefs.shtml
http://www.bbc.co.uk/schools/ks1bitesize/literacy/spelling/index.shtml
http://www.mattelscrabble.com/en/kids/games/hangman.html
Blends
http://www.primarygames.com/see-n-spell/blends/start.htm
http://genkienglish.net/phonicsgame3.htm
Initial sounds
http://www.bbc.co.uk/schools/laac/words/dg2.shtml
Concepts about print
http://www.roythezebra.com/reading-games-capital-letters.html
http://www.bbc.co.uk/schools/magickey/adventures/lug_game.shtml
http://www.bbc.co.uk/schools/ks1bitesize/literacy/punctuation/index.shtml
http://www.bbc.co.uk/schools/magickey/adventures/hms.shtml
http://www.bbc.co.uk/schools/magickey/adventures/dragon.shtml
http://www.lancsngfl.ac.uk/curriculum/literacy/lit_site/lit_sites/alpha_drag/widepage.htm
Word families
http://www.roythezebra.com/reading-games-words-that-rhyme.html
http://www.readwritethink.org/files/resources/interactives/wordfamily/
http://www.freerice.com/
http://www.korero.maori.nz/forlearners/basics
http://www.infoblitz.co.nz/index.html