We certainly had some excitement around here last week. It all started when Blake and Will were visiting last weekend. They were riding their bikes when Blake fell and hurt his hand, so he went to the emergency room to check it out. Sure enough, he had a broken finger! After X-rays and a taped up finger, Blake seemed hardly the worse for wear, so we decided to stop by the local ice cream store on the way home.
"Does it hurt much?" asked Will in a worried tone.
"Only when I forget and try to bend it," answered Blake. "I'm glad it's my left hand too, so I can still write."
"What are you thinking about writing at a time like this?" I asked, taking a bite out of my sugar cone.
"Oh, I was thinking of writing Mrs. Hayes. She's on a trip to Washington D.C. and it will be exciting to tell her about my broken finger – especially if I make up a math challenge about it," said Blake, laughing.
I had to admit that this was true. His teacher, Mrs. Hayes just loves math challenges. "As soon as we get home, I'll get some paper and a pen for you. Do you have an idea already?" I asked.
"Yes, in fact I do," said Blake, smiling a bit. "I was listening to the doctor as she was taping up my finger and I got an idea for it."
Here is what Blake wrote to Mrs. Hayes:
Dear Mrs. Hayes,
I fell off my bike and broke one of the finger bones in my left hand. But I have lots more bones in my hands.
Can you figure out how many unbroken bones I have on my hands?
Here are some clues:
I have 2 bones in each thumb.
I have 3 bones in all the other fingers.
I have 2 more palm bones on each hand than finger bones on each finger.
I have 3 more wrist bones on each hand than palm bones on each hand.
See if your students can figure out the answer and tell how they figured it out!
Blake T.