Answer:
105
Explanation:
15 X 7 =105
105 is the least 3 digit multiple of 7.
12 X 7 = 84
84 + 7 = 91
91 + 7 = 98
98 + 7 = 105
or use multiplication 13 X 7= 91, 14 X 7=98
15 X 7 = 105
This is guess and check until the sum or product is a 3 digit number. It helps if you know the 7 times table at least through 7 X 12 = 84.