How many 7s are there in 147?
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07,17,27,37,47,57,67,70,71,72,73,74,75,76,77,78,79,87,97,107,117,127,137,147,157,167,170,171,172,173,174,175,176,177,178,179,187,197. Between 1 and 100 : 7, 17, 27, 37, 47, 57, 67, 70, 71, 72, 73, 74, 75, 79, 77 (two sevens), 78, 79, 87, 97.