Thursday, October 17, 2013

Math Riddles

I read this riddle on Highhill Homeschool latest blog posting Multiplying Fractions and thought it seemed like fun, so I called my girls over and had them each, using a pen and paper, work it out. Surprisingly, my youngest (and that's because she hasn't really worked on fractions yet) worked out the answer before her older sister (who has).

One time a mom made a pie for her four children. The first child came to her and asked for some pie. The mom said "you can have 1/4 of the pie." Then the second child came to her and asked for some pie. The mom said "of course, you can have 1/3 of the pie." Then the third child came to ask for some pie. The mom said "yes, you can have 1/2 of the pie." When the last child asked for some pie the mom said "you can have it all." Who got the most pie?

Answer: They all got the same amount.

They enjoyed it so much that they asked for me so I searched and found some more Math Riddles for them to do.

No. 1  --  Two fathers and two sons sat down to eat eggs for breakfast. They ate exactly three eggs, each person had an egg. The riddle is for you to explain how.

Answer: One of the 'fathers' is also a grandfather. Therefore the other father is both a son and a father to the grandson. In other words, the one father is both a son and a father.

No. 2  --  How can you add eight 8's to get the number 1,000? (only use addition)
Answer: 8 + 8 + 8 + 88 + 888 = 1,000
No. 3  --  If there are 4 apples and you take away 3, how many do you have?
Answer: You took 3 apples, so obviously you have 3.

They just loved doing these so much so that I have been asked to find more riddles to give them.

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