Attmu Alphabet Puzzles Wooden Puzzles for Toddlers Toy

Same way they used to teach it in 1st grade, but 2 years earlier. There's often more of an emphasis on visuals, manipulatives, and songs too, eg. my kid's kindergarten teacher linked us to this song [1] on the first day, and there's dozens of similar resources on YouTube.

A family friend of ours (retired Tesla engineer) taught his 18 month the alphabet. He did it with a bunch of alphabet puzzles [2] and blocks. My 16mo is showing similar interest, but unfortunately I don't have the time to sit down with him, go over each letter, and explain how they go together. He will grab a book (or 5) off the bookshelf, bring it over to me, and say "Read this", though.

For math - my kid had learned the powers of two up through 4096 by kindergarten through playing Snake-2048. My wife and I started introducing addition and subtraction just in ordinary life - we'd say "Okay, if we have 4 strawberries, and you reserve one each for mommy and daddy, how many do you get to eat?"

Now (age 7) he'll quiz me in the car with seemingly random numbers like "What's 177 * 198?", and it's a good opportunity for me to introduce a bunch of mental math tricks like binomial expansions for multiplying numbers near 50 or 100, or prime factorizations. I'll usually turn the questions back on him too, like "Well, that's 200 * 177 - 2 * 177. What's 2 * 177?" and then he's like "I dunno" and then I'll say "What's 2 * 180?" and he says "360" and then I say "Now subtract 2 * 3" and he says "354" and then I'm like "Okay, if 2 * 177 = 354, what's 200 * 177" and he'll say "35,400" (because he already knows the trick for adding zeros) and then I'll say "Subtract 354" and he'll say "35,046" which is the correct answer.

[1] https://www.youtube.com/watch?v=36IBDpTRVNE

[2] https://www.amazon.com/Attmu-Toddlers-Alphabet-Preschoolers-...

[3] https://www.miniplay.com/game/snake-2048-io