When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
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@futurebird 6*7 is 42, which I have memorized like most of the multiplications up to 12*12.
But 9*6 = 54 is one I can never remember on its own. I always go 8*6 and then add 6.
@aesthr @futurebird the 9s are easy though! Because it’s whatever the non-9 number is (6) minus 1, so 5, then make it add up to 9 (5+4=9). I have no idea why this is easier for my brain than any other addition/subtraction
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@futurebird I have the weirdest thing with this.
When I had to learn those multiplications my mom would question me for practice. I always forgot the answer to 7*8.
One day we were in the living room and the TV remote was on the table. Remember the numbers on that:
1 2 3
4 5 6
7 8 9So I saw 7 and 8 on there, and the right answer just above. It clicked in my head.
So whenever I have to multiply 7 and 8 I see a TV Remote in my head. We don't even own a TV, I havn't had one since 2001.
@johnnythan @futurebird ars memoriae
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird for 7*8, 56 is memorized, but for other multiplications like 7*9, I think 70 (7*10) minus 7 = 63
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird for some reason 7*8 is the most difficult pair in the multiplication table, and because this had been a topic again and again in elementary school, so I actually sort of memorised the phrase "7 times 8 is 56".
For others I might go 8 * 9 is like 8 * 10 and then subtract 8 * 1 to get 72.
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird I go “8 times 8 is 64” to verify so I guess I have some kind of mechanism with minimal memorization.
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@futurebird 6*7 is 42, which I have memorized like most of the multiplications up to 12*12.
But 9*6 = 54 is one I can never remember on its own. I always go 8*6 and then add 6.
@aesthr @futurebird funny how everyone has *one* multiplication pair that just doesn't compute
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@futurebird We spent ages learning "times tables" by rote up to 12 (a hangover from the imperial measurement system), so in principle the answer to any small multiplication just springs to mind. Strangely some combinations seem to be unusually tricky to remember, and 7*6 is one of them. Whereas 7*8 is much easier.
@kbm0 @futurebird we went up to 10*10 in West Germany.
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird 56 instantly, but I had Lucky Seven Sampson help me learn it
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird
I do 7x7 +8, so I voted via other math -
When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird I work with networks a lot, so the powers of 2 are burnt into my brain at this point. 64 is 2 to the power of 6, which by powers laws is 8 squared. 7 x 8 is 8 less than 64. And this explanation took a lot longer than the process takes.
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
14, 28, 40, 56
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird
8 * 5 = 40
8 * 2 = 16
Then add them.Yes, every time.
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Off topic, but why does Mastodon offer two things to click on if it's only been edited once?
V confusing.
@futurebird@BenAveling One is the pre-edit version, one is the post-edit version.
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird
14*4 -
When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird in elementary school you could at any time (Montessori school) take a times table challenge, and if you got everything right you got I think a stick of gum. This was a big deal to me as Mom was pretty strict about our dental health growing up so we were only allowed sugarfree gum at home
also when we learned them as a class there were songs which also helped. I still remember the tune for the 3 times table song because it was catchy as hell
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For certain types of multiplication... I multiply by 10 (or 100), 1000 and so forth, then subtract the smaller number.
So 7*8 becomes 70 - 2*7 (14) = 56. Obviously I don't do that with such small numbers, but it does work very well when using larger ones.
By converting the answer into two smaller and quicker to answer ones... I get to the answer quicker than some people trying to do the single way.
@Anomnomnomaly @futurebird Yes! Back when my daughter was a wee one, they hade the concept of "10-friends" in school. Memorize 1 for 9, 2 for 8, 3 for 7 and 4 for 6 (5 of couse and, 0 for 10). Thats it! One gets that memorized (backbone level) and methodology for in-head-math will pop up. Beautiful if mentors do credit kids for re-inventing math /methodologies/. I hope this is legible.
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@Anomnomnomaly @futurebird Yes! Back when my daughter was a wee one, they hade the concept of "10-friends" in school. Memorize 1 for 9, 2 for 8, 3 for 7 and 4 for 6 (5 of couse and, 0 for 10). Thats it! One gets that memorized (backbone level) and methodology for in-head-math will pop up. Beautiful if mentors do credit kids for re-inventing math /methodologies/. I hope this is legible.
@Anomnomnomaly @futurebird In other words: we/i claim that it is better NOT to memorize the table of multiplication in favour of thought trains. That helps with understanding. As opposed to using an LLM btw.
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@Anomnomnomaly @futurebird In other words: we/i claim that it is better NOT to memorize the table of multiplication in favour of thought trains. That helps with understanding. As opposed to using an LLM btw.
@Anomnomnomaly @futurebird Theese things get me going...
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird Nuance: I do have 7x8 memorized, but the answer to the actual question is that I usually pick the closest one I do know and add/subtract, or other similar 'trick'
We listened to musical times table records in 6th grade and a lot of them are still in there.
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When you need to multiply 7*8 do you simply have it memorized, or do you need to add, subtract or otherwise connect it to another math fact that you know better?
That is do you simply think "56" or are there more thoughts that lead to 56?
@futurebird I often factorize somehow and add things up. That way you get to see the numbers, and you can remember your frequently used numbers - not that I'm usually very trained. (lol *grin*)
