Question

which list shows all the positive factors of 15?
1,15
1,5,15
1,3,15
1,3,5,15
last question!!

Answer 1

1,3,5,15

Answer 2

study up your multiplication tables and these will come easier to you.

Answer 3

i know but its really hard to rememeber:\

Answer 4

it's a pain at first but you will find everything else for many subjects so much easier once you get them down.

Answer 5

thanks(:

Answer 6

Here are some tricks to better remember your multiplication tables.
2: Are always even. 2*8 = 16
5: Always end in 5 or 0. 5*5 = 25 & 5*2 = 10
6: Always also divisible by 3
9: Digits always add to 9 when 2 digits. 4*9 = 36; 3+6 = 9
10: Easy enough. Just add a zero.
11: Digits repeat when 2 digits. 2*11 = 22; Middle digit is one plus last digit when 3 digits. 11*11 = 121; 11*12 = 132

Refer here for further explanation: http://mathforum.org/k12/mathtips/multiplication.tips.html