I didn't know I was good at math until my friend loaned me his Texas Instruments calculator in grad school.
Everything changed. The world became a simpler place.
The first hand calculator I ever saw was from Texas Instruments. It couldn’t do much beyond add/subtract/multiply/divide. This would have been in about 1972 and its owner paid eighty dollars for it. This was about the time ‘digital’ wrist watches came out with their itty-bitty numbers that came on when you pressed a button where the stem winder would be. Remember those? Well, they were still better than pet rocks.
Any calculator will not elucidate differential equations, calculus, Greens theorem, or any other bit of mathematics.
Calculators allow you to number crunch