Quote:
Originally Posted by Velvet
Yes, but I used the calculator to teach my children in grade 3 multiplication. They made their calculation and then checked to see if they got it right. A calculator can be used just like a book, you can use it to learn and my students knew their multiplication (and as a result their division) tables orally up to 12 X 12 before they entered grade 4. Today I would teach them how to use AI.
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We didn't have calculators. We had to learn the actual math. My mom wasn't good at math. My dad was VERY good at it. He's the one who taught me how to understand it. No calculator, none needed. I learned to add and subtract on an abacus, and with coin and paper currency as my tools.
Dad taught me the "trick" to memorizing the 9 table. 9 18 27 36 45 54 63 72 81 90 99 108 117 126 135 144 The right-most digits go 0 through 9, the digit next to them will go 9 through 0, the digit next to that one will go zero through nine, and so on into infinity. - and when you add each digit of the multiple up, and keep adding until there's only one digit, the answer is always 9. That's how you can check your math to see if you're correct. Example - 9*4782=43,038. 4+3+0+3+8=18, 1+8=9.