This is exactly right as far as math is concerned. After teaching for over 30 years, I still sub. I’ll go into a 2nd grade class where the kids are working on fractions—for say a month. They still can’t even add and they’re shown fractions. At least half of the 8th graders cannot do single-digit multiplication without the aid of a calculator. Even subtraction problems require a calculator. As for fractions, the 8th graders can’t grasp that most calculators aren’t set up for fractions. 1/3 + 1/3 = .6666666, not 2/3.
In 7th grade we were “encouraged” to rote memorize the squares of numbers up to 30. Knowing this also allowed you to roughly estimate the square root of numbers via interpolation
Still use this even in the days of cell phone calculators and teraflop desk top computers