Among high school students and adults, girls and women are much more likely to use traditional, step-by-step algorithms to ...

Students go over using number lines to solve the four equations in a fact family. In this lesson, students go over using number lines to solve the four equations in a fact family. Julia uses charts, ...

Professional mathematicians have been stunned by the progress amateurs have made in solving long-standing problems with the ...

Addition & subtraction strategies to solve two-digit equations using an open number line. In this lesson, students go over using addition and subtraction strategies to solve two-digit equations using ...