Do you have good methods to calculate double digit multiplication quickly and mentally? Plzzz give me some good tips. WILL GIVE BRAINLIEST

It is not that hard,

Step-by-step explanation:

Lets say you have 34 45=1530

34

45

4x5=20

5x3=15

        30

mark out the 5 and change it to a 0 bring down the 0

4x4=1 6

4x3-1 2

total of

1530

Just multiply the numbers 5/4 and 5/3

carry the numbers mark out 5 and put 0 drop down 0

then do the numbers 4/4 and 4/3

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560