Math Web Sites

Multiples

https://www.mathplayground.com/multiples.html

Adding Fractions with unlike denominators

https://www.ixl.com/math/grade-5/add-fractions-with-unlike-denominators

Add & Subtract Mixed numbers with like denominator 

https://studyjams.scholastic.com/studyjams/jams/math/fractions/add-sub-mixed-numbers.htm
https://www.ixl.com/math/grade-5/add-and-subtract-mixed-numbers-with-like-denominators

Lines, Rays and Line Segments
https://www.ezschool.com/Math/Lines/tutorial.html

Order of Operations

https://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire.html