This is bad -- an F grade for the education system that let them slide by without learning an essential skill. The chinese aren't this lazy. And if we persist in not learning this, America's future will regress to us asking them, "Do you want fries with that?"
For one thing you do not need to do much arithmetic to do algebra, for another estimating and getting a feel for numbers is not the same skill as learning a bunch of arithmetic techniques. No one is going to do long division while shopping.
I can keep enough digits in my working memory to do long division in the grocery aisle.
I also compulsively factor numbers on license plates..
The best thing to do is to set the kids up to learn the most important thing - which is how to teach oneself. If a kid can read about something, and then understand what was important from the reading, and then write about it, and then know where to go next they will be well served in the AI world.