Also, there are two parts to math: calculation and reasoning. If your kid struggles with calculation, no big deal as they can just use a calculator. If your kid struggles with math reasoning, then high school courses will be very challenging. They aren't necessarily related. I have students that needed their fingers or a calculator to add 2+3, but were B students through algebra, geometry and algebra 2. They understood the reasoning, saw the patterns, knew how to apply formulas and check answers. They just couldn't remember or do basic math mentally. On the other hand, I have had kids that knew all their times tables, could do long division, but just could never figure out when to apply which theorem or postulate.