arithmetic
Multiplying and Dividing Fractions with Area Models and Fraction Bars: Multiply & Divide Fractions
Multiply & Divide Fractions is a no-prep digital tool for grades 5–6: area models for a fraction of a fraction, fraction bars for fraction × whole, and fraction pieces laid along a bar to divide, with every answer in simplest form.
arithmetic
Mental Math Strategies for Division: self-checking, instant feedback
Halving, doubling, dividing in steps, multiples of 10 and partial quotients explained with dot arrays and base-ten pictures, a free number talk for grades 4 to 6, and a self-checking digital version of the slide deck.