The National Centre of Excellence in the Teaching of Mathematics (NCETM) has just launched two new Facebook groups, one primary and one secondary, to help parents with any Maths questions you may have. Any questions you have will then be answered by an experienced Maths teacher.
These are brand new groups so please share these with your schools and encourage parents to join.
Primary maths - teachers supporting parents - https://www.facebook.com/groups/primarymathssupport/
Secondary maths - teachers supporting parents -https://www.facebook.com/groups/secondarymathssupport/