this simple multiplication is made easier by taking an indirect route to the answers that arent obvious. for example, I take 48 x 4 and see it as 50 x 4 (which i automatically know is 200) minus 2 x 4 (8) and get the answer 192 in two seconds. But if I multiply 4 by 40 and then 4 by 8 and add them together it takes 2 or 3 times as long.
Weird, I like splitting the tens and ones columns, multiplying those, and adding them back together. Your method would take longer for me. Different minds!
Funny the range of difficulty you get, I do this quiz a few times to get my brain going; on average I get it finished with about 15 seconds left, but I just did it twice ending with just under a minute left over because I got some quite easy questions. But then yesterday I did it a few times where I ran out of time with 1 or 2 still unanswered.
16/20 on this try. I guess it depends a bit on how many easy ones you get too. The ones I didn't have time for were: 24x18, 14x23, 33x17 and 71x8. Yes, the last one of those would've been easy, but didnt spot it when doing others.
Ok if anyone has trouble doing these, I have a way.
Ok say your problem is 92x4. I would take
the first ten and the last one. ( so basically the distributive property,
Ex - 90x4 ( 360 ). Then add the ones. ( 2x4 ) your answer is 368
If thats your way to recognize me for doing in 1 month, the same quantity of points that you have done in like 2 years, your comment is really welcome.
Looks like we've got a lot of people coming in at around a minute and getting all 20. To me, that sounds like you could lop a minute off the time and still have a fun quiz, but with some time crunch.
Finished all of them with 2:29 left and I'm only 4 years old and have been diagnosed with severe, crippling autism. I'm also a small Indian child in Mumbai with no internet connection.
Good quiz, for you jetpunkers who like a challenge try 'The CHALLENGE' a puzzle-quiz to think about at ... ... http://www.jetpunk.com/user-quizzes/120558/the-challenge
I scored 20 0ut of 20 and talking from Bangladesh. I am good at math as use of calculators are banned in my country if you do not study for at least 8 years .The brain is the only adoption even in civil service and job exams.What anAmerican studies in 9 and British in 10 years ,we study it in 5 years and we do get the feat.We study Pythagoras when we are only 13!Feat to my country. Over use of calculators won't benefit you.
tough especially since I have memory issue because of my disease (often forget halfway a sentence what I was trying to say, and in the beginning i couldnt read anymore, cause after the second word I had forgotten the first. Reading got like 60% better, still cant focus at all. but math .. I allways get stuck after the first number even with the most basic stuff like 18+5 it took me several minutes sometimes, cause my mind was like a record being stuck, couldnt get past 18+....18+.....18+..... )
so extremely happy I finished this one with 100% the first go !! And actually quite surprised!