Prime Factorisation (continues...)

25.the prime factorisation of a number is 2⁴x3⁵x7²x11. write down 3 factors of the number that are greater than 100.

ans: 2x2x2x2=16 3x3x3x3x3=243 7x7=49 11x1=11

16x243x49x11=2,095,632

->16x243=3888

->243x49=11907

->49x11=539

26.the prime factorisation of two numbers are 2 x 3² x 7³ x 13 and 3 x 7² x 13³x17. write down 3 common factors of the numbers.

ans: 2x2=2 3x3=9 7x7x7=343 13x1=13 ----> 2x9x343x13=80,262

3x1=3 7x7=49 13x13x13=2197 17x1=17 ----> 3x49x2197x17=5,490,303

->3

->13

->21

*the highlighted numbers are the answers*