M bought a book that had 144 pages numbered from 1 to 144. He took a pen and circled all the 4s that appeared in the page numbers. How many circles did he draw?
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Answer:
16 circles (as there are eleven 4's to circle between 1 to 144)
Step-by-step explanation:
From 1 to 10 there is only one 4.
From 11 to 20 there is only one 4, which is in 14.
Basically each group of then has one 4 in it: 4, 14, 24, 34, 54, 64, 74, 84, 94, 104, 124, 134, except for 44 and 144, where each has two fours.
If they circled every 4 on each page, the total circles they would have drawn is 16.
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