It’s April, and in math class the countdown is on. There is limited time left before standardized math testing or the end of the school year—and many math teachers are feeling the pressure to either rush through remaining math content or coast to the finish. This time of year creates a real tension in math instruction. Teachers want to maximize the time that’s left, but they also know that flying through math units won’t lead to retention or confidence. At the same time, no one wants to lower...