Reddit » Math

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This subreddit is a mathematics space, for the lot of us who spell the word correctly!

Reddit » Math

1d ago

Number
Rule
Examples
801
The number is a multiple of 9 and 89 at the same time
1,602 is a multiple of 801 because 1 + 6 + 2 = 9, which means it's a multiple of 9, and 160 + 2 x 9 = 178, which means it's a multiple of 89
802
The number is a multiple of 2 and 401 at the same time
1,604 is a multiple of 802 because it ends in 4, which means it's a multiple of 2, and 160 - 4 x 40 = 0, which means it's a multiple of 401
803
The number is a multiple of 11 and 73 at the same time
1,606 is a multiple of 803 because 160 - 6 = 154, which means it's a multiple of 11, and 160 + 6 x 22 = 292 ..read more

Reddit » Math

1d ago

The square root of a number is the number that multiplied by itself is equal to the number. So sqrt(4) should be 2 because 22=4 but also -2 because -2-2 = 4 also.
So why is sqrt4 not -2
submitted by /u/Thanospapa12345
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Reddit » Math

1d ago

can anyone explain why there is an extra constant b in the *ej
submitted by /u/TurnoverSpirited7020
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Reddit » Math

2d ago

I was a top-scorer at maths at school, but I was sure I was just an imposter, because curriculum maths can be perfected via method memorisation/pattern recognition. I was right. Now I struggle a lot with word problems and even understanding what the question wants me to do.
Being able to think structurally and logically is important in life, so I guess the easiest way to address that is brushing up my maths.
Any tips on how to get better?
submitted by /u/OkSilver9273
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Reddit » Math

2d ago

Hey everyone,
I am just curious - if we didn’t have access to a graphing calculator or computer, is there a way to find out that “c” in y = ax2 + bx + c has no effect on x and can be ignored when solving for x? (I only know that it does not have an effect on x and can be ignored when solving for x because of the fact that the graph will just go up or down but the x value won’t change).
1) So without resorting to graphing or computers, how could we know that x can ignore “c” but solving for “y” can’t!?
2)
This brought me to another question: how can we know by looking at ANY equation - (assumi ..read more

Reddit » Math

2d ago

Working out too might help
submitted by /u/JustASlmplePerson
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Reddit » Math

2d ago

Like what topics are needed, from what youtuber can i learn it, when to use it etc
submitted by /u/Ok_Work_5257
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