Given a sum 70= 25+45, rewrite 25+45 using their GFC and multiplication.
To rewrite 25+45 using their greatest common factor (GCF) and multiplication, we first need to find the GCF of 25 and 45.
The prime factors of 25 are 5*5, and the prime factors of 45 are 3*3*5. The common prime factor is 5.
The GCF of 25 and 45 is 5.
Now, we can rewrite 25+45 using their GCF and multiplication as:
25 + 45 = (5*5) + (5*9)
Simplifying further:
25 + 45 = 5(5 + 9)
Therefore, 25+45 can be rewritten as 5 times the sum of 5 and 9.