Have you heard the research about the average young mathematician's inability to give an accurate measure of an object when it's moved to a spot on the ruler other than 0? The results are not so good and prove that the typical youngster doesn't understand a ruler and how to use it.
Donna from Math Coach's Corner has a great post about this concept and uses broken rulers to help remedy this measurement problem for kids. I combined her idea with a review concept I saw on Mrs. Daniel's blog Second Grace Sparkle to create the following activity.
I made the following four pages of broken ruler cards and cut them apart to create 24 individual cards.
If you're looking for a great math blog to follow, I'd recommend checking out Donna's. She knows what she's talking about!
FYI: This lesson was preceded by the creation of informal rulers, which definitely set them up to understand the above activity better. Go here if you'd like to know more.
Great math lesson! Love the freebie too!
ReplyDeleteLori
Conversations in Literacy
Lori, thanks so much. I'm glad you think so!
DeleteI really appreciate this! I was shocked to see so many of my firsties start measuring at 1 inch if the zero was not printed on the ruler. What an eye opener!
ReplyDeleteMelissa, it is an eye opener for sure.
DeleteAwesome freebie. My 3rd graders still have trouble with this - thanks!
ReplyDeleteHeather
Kickin' It With Class
Heather, I think the studies show that even 5th graders can be tricked by this. Hopefully what we're doing in the younger grades will fix that now.
DeleteThanks so much for this great adaptation! I just blogged about it! :)
ReplyDeleteDonna
Math Coach’s Corner
Donna, that makes my day. Thank you so much for spotlighting my blog.
DeleteOkay, clearly it's just me and I must be having a brain bubble moment, but I don't understand how you're using these. I looked at Donna's post and that didn't help me either. If they're looking at an object NOT placed at the zero, how is that helping them? ALL your ideas and posts are fabulous, Tammy, so I know I'm going to read your reply and say "Oh duh, I should have figured that out." Ha ha. Please help me :))
ReplyDelete❀Barbara❀
Grade ONEderful
Ruby Slippers Blog Designs
Barb, I doubt you're the only one who wonders about this. This is a new concept for me too. I'll email you. (You make me smile by the way.)
DeleteHi Tammy,
ReplyDeleteI came over from Donna's blog to check out your broken ruler activity. Love what I am seeing and will be your newest follower. As soon as our printer/copier gets fixed (hopefully before the weekend starts!) I am going to head down and make a set of these to use with my K-2 kids. Thanks!
Tara
The Math Maniac
Tara, I'm very honored that you would follow me. Thank you for doing so and leaving a comment too!
DeleteThis is exactly what I need for my second graders. Thank your for sharing!
ReplyDeleteAnonymous, I'm glad to hear this hit the spot!
DeleteI am shocked about the broken ruler concept ... I actually had a high school math class using slide rule! I love your way of bringing them back to the basics!
ReplyDeleteBarbara
Barbara, this misconception was new to me too. Thankfully we're on the right track now.
DeleteThank you - this is the lesson I was going to teach tomorrow, and you just made it 100% better!
ReplyDeleteLisa, wow so cool. I'm glad to hear that!
DeleteThis is great! I teach math to pre-service elementary teachers, and they often do not appreciate the difficulties involved in measuring with a ruler. I plan to direct them to this post. I am sure that they will learn a lot from your experiences. Thank you!
ReplyDeleteDolores, I'm glad you and your pre-service teachers will find this helpful. Thank you!
DeleteLove this freebie and the use of talk and swap. I've heard this method also called Quiz-Quiz-Trade.
ReplyDeleteThanks! I hope the freebie helps out.
DeleteI think this lesson is great, but it would most certainly be important to have a discussion with the children about the reasonableness of these measurements. The items pictured would not reasonably be this amount of cm. The "does this make sense?" discussion would definitely need to come soon after the activity was presented.
ReplyDeleteThis is definitely a valid point. Thank you!
DeleteActually, I saw it differently. I would require students to identify the most reasonable unit of measurement along with the numerical measurement (cm, inches, or feet). This would add a layer of rigor. It works for a lot of the cards (e.g., a flag that is 2 feet long), but maybe some of the unreasonable ones could be redone so they all make sense.
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