1. What’s a good method to solve this problem mentally? (2015 + 2015) x 50 (Note: “good” is subjective, and there could be more than one right answer, but your solution will need words. The ‘answer’ to the problem itself is not the issue. :-))
2. Next year (2016) is a leap year. On what date next year will 2/3 of the year have elapsed?
3. Use these clues to figure out the year the first US transcontinental railroad was completed:
a. The sum of the digits is 24.
b. The ones and the tens digits are multiples of 3.
c. The hundreds digit is 1 less than the ones digit.
4. The centers of fence posts are 30 inches apart. They enclose a triangular region 20 ft x 20 ft x 10 ft. How many posts will be needed?
Held over from last week:
5. If the digit 7 is written at the right of a certain number, that number is increased by 70,000. Find the number.
6. How many whole numbers are between the square roots of 8 & 80?
7. The number 6, say, has 4 whole-number divisors: 1,2,3,and 6. What is the smallest number with exactly FIVE whole-number divisors?
8. Take a person with a pulse rate of 72 beats/minute. How many times will his/her heart beat in April?
Your picture of the week (which is very nice, by the way) reminded me of an old joke. This guy goes into a 2-holer in the Ozarks, one of which is occupied. So, he sits down to do his business. The other guy finishes and begins pulling up his bib overalls. All of a sudden, several coins slip out of his pants pockets and go down into the hole he has just vacated. Without saying a word, the man pulls out his billfold, removes a $20 bill, and throws it down the hole after the coins. Astonished, the man still seated asks, “Why on earth did you just throw a $20 bill down that hole?” The first man responds, “You don’t think I’m gonna crawl down in there for 75 cents, do you?”
Now THERE is a solution to a [sort of] math problem.