Numeracy activities and worksheets from Entry level to Level 2: https://www.skillsworkshop.org/numeracy
Adult Numeracy Core Curriculum: http://www.excellencegateway.org.uk/content/etf1075
Interactive worksheets from Entry to Level 2: http://studymaths.co.uk/workoutMenu.php?type=all
MathsWatch: https://vle.mathswatch.co.uk/