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.
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.