Question: what math facts should a 1st grader know?
Answer: First graders count to 120, but the catch is that they can start from any number, like 72, and count up to 73, 74, 75, and so on. Kids also learn to subtract numbers up to 20, like 19 – 7 = 12. Students learn to solve word problems using objects, drawings, and, yes, even equations.