arithmetic
Halloween Multiplication Arrays: Self-Checking Candy Arrays for Grades 2-4
Halloween Candy Arrays is a no-prep, self-checking digital activity: students drag candy groups into equal groups that snap into arrays, then explore the commutative, associative and distributive properties and model multiplication facts. 75 slides.
arithmetic
Mental Math Strategies for Multiplication: 107 Self-Checking Problems, Instant feedback
Multiplying by 9, 11 and 5, doubling, factors of 100 and 1000, rounding, and halving and doubling explained with base-ten blocks, a free number talk for grades 3 to 5, and a self-checking digital version of the slide deck.