Here is a part-whole model. Sometimes the model is rotated. It looks different, but it still has two parts and a whole. We can use this model to help us solve problems. We can put 4 things in one of ...

When adding or subtracting fractions, you need to look at the denominator. If the denominator is the same, then you can just add or subtract the numerator. If the denominator is different, then you ...

Can people make things better by subtracting from what exists? As examined in research by Darden Professor Gabrielle Adams, when people are trying to solve a problem, they focus on what they might add ...