Adding and Subtracting Integers tool/game-Integer Heights
Why is 2 − (−3) bigger than 2? Balloons are +1, weights are −1, and taking away a weight makes the balloon rise. The big idea, zero pairs, a free number talk for grades 6 and 7, and Integer Heights, a self-checking digital game.
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.
Math Talk Slides That Check Themselves: 124 Self-Checking Math Talks for Grades 3-5
Our Math Talks slide deck, all 124 slides, now self-checking: open-ended slides that accept every correct answer, hints that point back to the picture, and step-by-step solutions for every puzzle. Grades 3 to 5.
Math Talks : Why Open-Ended Questions Matter, and 150 That Check Themselves
Why math talks build reasoning and number sense, why open-ended questions with more than one right answer matter most, and a self-checking set of 150 math talk cards in 15 styles
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.
Mental Math Strategies for Addition and Subtraction: 117 Self-Checking Problems
Compensating, decomposing, balancing and clustering explained with base-ten blocks, a free number talk for grades 2 to 5, and a self-checking digital version of the slide deck.