UIL Number Sense Team
UIL Number Sense Team Tools
UIL Number Sense Team Tools
https://www.uiltexas.org/academics/stem/number-sense
Scoring is plus 5 points for each correct answer and minus 4 points for each wrong answer or skipped problem up to the last one attempted.
http://bryantheath.com/number-sense-tricks-manual/
http://bryantheath.com/middle-school-number-sense-practice-tests/