Showing posts with label prime numbers. Show all posts
Showing posts with label prime numbers. Show all posts
Monday, November 8, 2010
Thursday, November 4, 2010
Math question for the day
Bob and I got a phone call last night from our favorite nine-year-old, Wen-Ting Wong. She needed help on her math homework. The question was: For every prime number greater than 10, which digits are possible in the one's place?
a. 1, 3, 7, 9
b. 1, 3, 5, 9
c. 0, 2, 4, 5, 6, 8
d. 1, 3, 7
This is 4th grade math. Bob and I resorted to Google. Do you know the answer?
a. 1, 3, 7, 9
b. 1, 3, 5, 9
c. 0, 2, 4, 5, 6, 8
d. 1, 3, 7
This is 4th grade math. Bob and I resorted to Google. Do you know the answer?
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