7+8=15 because seven and eight are two consecutive integers that add up to equal 15
1+2+3+4+5 = 15 because 12345, all add up together to equal 15, and they are all consecutive integers
7 times 8 = 56
1*2*3*4*5= 120
120-56= difference between the products of the numbers in each set= 64
If this help, mark as brainliest please!