Here is a wide variety of maths activities and websites accessing to keep their brains busy:
 
Telling the Time:
https://mathsframe.co.uk/en/resources/resource/116/telling-the-time

Timestables fun:

https://www.topmarks.co.uk/maths-games/hit-the-button
https://mathsframe.co.uk/en/resources/resource/399/Archery-Arithmetic-Multiplication

Roman Numerals:

https://www.transum.org/software/SW/Starter_of_the_day/Students/Roman_Numerals.asp

Rounding Numbers:
https://www.topmarks.co.uk/maths-games/rocket-rounding

Below there is a variety of games, exercises and puzzles to help you with your spellings. 

Spelling games and quizzes: https://spellingframe.co.uk

Year 3 and 4 spelling games: https://www.spellzone.com/word_lists/games-12890.htm

Spooky Spellings: http://www.ictgames.com/mobilePage/spookySpellings/index.html

Spelling word search: https://www.spellzone.com/word_lists/games-368726.htm

Spelling ‘ough’ words: https://www.bbc.co.uk/bitesize/topics/zt62mnb/articles/z9f2b82

Spelling ‘shun’ words: https://www.bbc.co.uk/bitesize/topics/zt62mnb/articles/zyv4qhv

Spelling ‘ture’ and ‘sure’ words: https://www.bbc.co.uk/bitesize/topics/zt62mnb/articles/z3jpk2p

Spelling mistakes: https://howtospell.co.uk/misspelled-words-quiz-1

Homophone quiz: https://howtospell.co.uk/homophonesquiz.php

To, too or two: https://www.bbc.co.uk/bitesize/topics/z22yqhv/articles/zc4jpbk