Brain Teasers
Sequential Times
Three-year-old Sam has just learned to count to 30! He especially likes to read the clock when the numbers are in order. For example, he likes 3:45, which he sees not as three forty-five, but as three, four, five. Can you find all the times when the numbers on a clock are in sequential order?
For an extra challenge, use a 24-hour clock (ignore one leading zero in the hour).
For an extra challenge, use a 24-hour clock (ignore one leading zero in the hour).
Hint
Look for both 1-digit and 2-digit numbers.A 12-hour clock has 9 sequential times, each one occurring twice per day.
A 24-hour clock has an additional 13 (22 in total).
Answer
A 12-hour clock has these:1:23 (one, two, three)
2:34
3:45
4:56
9:10 (nine, ten)
10:11
11:12
12:13
12:34 (one, two, three, four)
A 24-hour clock has these additional ones:
0:12 (zero, one, two)
13:14 (thirteen, fourteen)
14:15
15:16
16:17
17:18
18:19
19:20
20:21
21:22
22:23
23:24
23:45 (two, three, four, five)
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