Huh. You're at least trying. Well, all the crazy psycho stuff starts on the next chapter. Here is where I give you the small shot to prepare for the big needle. In other words, the simpler things.
Here we go.
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Odd and even numbers are like possessive and recessive genes. Odd being recessive. For example, in any case that an even number is present in multiplication, the product is always even.
E * E = E
(2x * 2y)
Things like
4 * 6 = 24
10 * 14 = 140
2 * 8 = 16
E * O = E
(2x * 2y+1)
Things like
6 * 7 = 42
8 * 3 = 24
14 * 11 = 154
And, lastly, O * O = O
(2x+1 * 2y+1)
Le things like
9 * 5 = 45
13 * 7 = 91
91 * 11 = 1001
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To multiply any two digit number by 11 quickly, take the two numbers and add them together. Place the sum in between the original numbers. If the sum is 10 or more, add 1 to the number on the left.
Examples:
15 * 11 = 165
1 + 5 = 6
29 * 11 = 311
2 + 9 = 11
72 * 11 = 792
7 + 2 = 9
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I like doing this already. It's gonna be a FUN ride.
ESTÁS LEYENDO
Mathemadness
De TodoI like math. When I was a kid, numbers were my version of toy cars. Equations, of action figures. Things I could break down and put back together. I come off as weird. I prefer unique. "Ew, you like math? How nerdy." "Yeah yeah. Now. How much were y...
