Textbook p9 #25: The three factors are 891, 539 and 2673.
The Prime factorisation of a number is 2^4 X 3^5 X 7^2 X 11.
Write down 3 factors of the number that are greater than 100.
(Hint: 16 X 11 = 176, which is a factor.)
16=2x2x2x2
15=3x3x3x3x3
49=7x7
3x3x3x3x11=891
7x7x11=539
3x3x3x3x3x11=2673
Textbook p9 #26:
The Prime factorisation of two numbers are 2 X 3^2 X 7^3 X 13 and 3 X 7^2 X 13^3 X 17 .
Write down 3 common factors of the numbers.
The three common factors are 2, 3 and 13.
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Cheng Ngee
ReplyDeleteTextbook p9 #25:
Note there's mistake in one of the lines
3^5 = 3x3x3x3x3 = 245
Indeed, the 3 answers you submitted are correct :D
Textbook p9 #26:
Could you elaborate how you arrive at the 3 numbers (2, 3 and 13)?
Indeed, amongst the 3 numbers you submitted, only "3" and "13" are correct whereas "2" is not the answer.
Do you have any idea why?
Could you suggest another common factor?