Everyone agreed on the first step: Solve inside the parentheses, for 2+2=4. But after that, people split down two paths. Some multiplied first, while others divided, leading to different answers—1 and ...

Solve one-step word problems using a visual model & a problem-solving process. Warm up with a Mystery Math Mistake to hunt for the mistake in adding two 2-digit numbers using a decomposition strategy.

Among high school students and adults, girls and women are much more likely to use traditional, step-by-step algorithms to solve basic math problems – such as lining up numbers to add, starting with ...