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Everything posted by Kit

  1. Sadly, no I can’t. I know there is a method, and I am not really supposed to do all those huge calculations, but my mind just doesn’t seem to retain it. With BA, I am learning different ways of doing things. I learnt yesterday about the ‘area method’ for long multiplication. Cool! and I am regaining my confidence, which the first 2 chapters of pre algebra had really knocked!
  2. I have always been interested in maths. I am almost 60 and my own education was patchy and truncated. I have read a lot, but not maths or science. I would love to understand maths, how it works, how to use it. Could you track viruses, predict earthquakes? And just the sheer fun of finally tracking down that x! I may never get there, but that’s no reason not to try. In fact if I was honest I would love to give myself a classical education, but I probably don’t have time normally (lockdown hopefully being an exception). So I decided to concentrate on maths. And I chose AoPS after much researc
  3. Hello again, from lockdown. I will be locked down for the next 4 weeks at least, so I am having a ‘maths camp’ in my house! However AoPS Pre Algebra is not going well. I am doing each chapter twice and still getting at least 50% of the exercises wrong at the first attempt. I usually understand the answer when I read it, but I don’t get there by myself. so.....I have taken advantage of AoPS offering beast academy Online for free for one month and have just started BA level 4. This is, sadly, not too easy! I do get everything right, but I do have to learn it first. Once I know what the
  4. I got it! Thank you for the tip off. i wallowed a bit 2^n =1/8 2*2*2=8 gotta go fractions....so negative? 2^-3?Tested it 2^-3 =1/2^3 =1/8 The I realised, after a bit, looking at the above, what we actually needed was 2^12=8^n and then simply negate the answer. so this is my working 2^12 = 2^n*2^n*2^n (negated) = 2^n+n+n (what 3 numbers added make 12?) Thus 2^12=2^4*2^4*2^4 =8^4(negated) And 8^4 negated is 1/8^-4. One eighth to the power of negative 4 phew! Thank you for the tip off, I appreciate it.
  5. Thank you. I’m off to the sofa with my notebook and a cuppa to consider this.
  6. Seriously! An arithmetic mistake! Opps! Thank you so much. while you are here, you couldn’t please give me a hint on where to start with Express 2^12 as a power of 1/8 Not the answer, just an angle of attack please. Thank you.
  7. Hello mathy people. I have a little “why am I wrong” puzzle for you. Find k. 3^3+3^3+3^3=243*3^k my working 27+27+27=81. 243/3=81 3^-3=1/3 thus 81= 243*3^-3 Their working. 3^3+3^3+3^3=3^1*3^3=3^4 243=3^4*3^1 We need to get rid of the 3^1 thus k= -1 As usual I can see why their way works, but not what I have done wrong with mine.... Thank you.....
  8. Im into chapter 2 and I’m enjoying squares, and I just thought I would tell you all that the next perfect square year will be 2025 which is 45^2! And I worked that out all by myself by counting on perfect squares from the easy one of 40^2 (1600...easy) and then each one more is when a is the year a^2 + 2a + 1 thus counting on from sixteen hundred in perfect square years we get 1681 (41^2) 1764 (42^2) 1849 (43^2) 1936 (44^2) 2025 (45^2)!!!! Can you believe I just spent about an hour working that out just for fun! 😅😅😅😅😅 I never thought I woul
  9. Yes, this is a really good idea, and I need to remember to do this. 😀
  10. Thank you for posting Lucy. It makes me very happy, and it’s very inspiring to hear another math ‘duffer’ has found her way through and to Pre Calculus no less! How exciting is that! Maybe one day I will be writing a post like this to encourage others on this mathy journey.
  11. Exponentiation! What a brilliant word. I will be learning exponentiation next !!!
  12. That’s a great idea if you think people would be interested.
  13. 3^2 is 3*3. (I just deleted my first reply i did 3*2 =6 🤭) so 3^2=9 2^3= 2*2*2? So 8? and if the above is correct then 2^4 would = 2*2*2*2=16
  14. Square 25, The next chapter is exponents. All I know about them is squares and that is the number doubled...time 2.....and that is it. Do you think I should bash on with AoPS or do them first with Khan academy, and then try the chapter? I like AoPS and I’m enjoying the challenge and the little grey cells working, but am I setting myself up for disaster here?
  15. Yes...got it whilst you were typing! Thank you so much for your help square. I’m feeling so much better now. We got it worked out!
  16. Oppps....plus the 222,222! Now it’s 999,999! I get the rotten egg award for that one 🤣🤣🤣🤣🤣
  17. An easy way to do 21* 37,037? well 10*37,037 would be easy...370,370. So double it and add another 37,037? Lets see if it works 370370+370370= 740740 And 740740+37037=777,777 😥 wrong......back to the drawing board. I’ll be back in a moment ........
  18. Ohhhhh oho oh oh oh oh oh.....I think I have it! I was just reading through the post to check for silly spelling mistakes etc and I think I saw the answer. I multiplied the product of 6*37,037 by 21 not the 37,037 itself! Is that right? Is that what I did wrong? so I should have multiplied 37,037 by 21 and then added the 222,222? obviously their way is simpler. 🤣☺️
  19. There is a question I don’t understand why my way of solving it is wrong. I can see that it is, and I even used a calculator to check it was and it wasn’t just an arithmetic mistake. I also understand what they did and why it works, but I don’t understand why my solution doesn’t also work. The question. The number 222,222 is equal to the product 37,037*6. What is the product of 37,037 and 27? AoPS solution is as follows: Because 6 times 37,037 is 222,222, we know that 3 times 37,037 is 111,111. So we have 27*37,037=9*3*37,037=9*111,111=999,999 I understand this and ca
  20. adult learner AoPS pre algebra. Chapter 1, Second attempt. I thought I would let you all know how I am getting on. So.....I started the book again. I read every word. I did the learning questions one at a time and then checked my answer before moving on. I did this because the learning questions are progressive, and if I misunderstood one then it throws the next one off. If I didn’t understand I went over it working through the steps until I did. I also started a note book and noted down the rules we proved, plus anything else I thought I ought to remember. I gave myself permiss
  21. Light bulbs are pinging on all over the place. Thank you, and Regentrude as well for explaining all this. Just wait until we get to the challenge questions 🤣🤣🤣 it seems you had a great education, in maths at any rate. I am nearly 60, and semi retired. I thought learning maths would be a nice little hobby, 😉
  22. Well.....now we have those 123,000 bottles in a big heap and we have to divvy them up into 1001 crates. And if they don’t fit exactly some crates will be short if we put the extras in some crates, leaving others with one less, or..............we have to start smashing bottles and spreading the shards around evenly 🤣🤣🤣🤣🤣 This doesn’t sound like a very mathematical explanation......nor very useful if you want to use the bottles........
  23. Ummm......in words! 1000 lots of one hundred and twenty three. Is that what you mean? So if I had 123 bottles in a crate it would mean I had one thousand crates.....and 123,000 bottles altogether........?
  24. So 1001/1001 is 1.....of course it is!!!!! Because 2/2 is 1. Ha! 🌞🌞🌞🌞🌞🌞🌞🌞🌞
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