Parents everywhere are stumped by another Common Core math problem. This time, the third-grade assignment in question fueled a viral Reddit debate on what 5 x 3 equals.
The student wrote 15, because "5 + 5 + 5" equals 15. The teacher marked it wrong because of how the student arrived at the answer; the correct answer, according to the repeated addition problem is: 3 + 3 + 3 + 3 + 3 equals 15.
Common Core defenders say this way of critical thinking instead of memorization will be useful when students do advanced math (for example, in a high school multivariable calculus class). Meanwhile, parents are still panicked and frustrated at not being able to help their kids with their homework, arguing for "common sense" instead of Common Core.