Word Problem Wednesday – Dogs and Ropes

“The Internet Is Losing It Over This Second Grade Math Problem,” reads the headline from an article posted online by msn.com. The article goes on to support the student’s mother’s conclusion that, “this isn’t exactly a question most 8-year-olds would understand.”

The problem reads, “There are 49 dogs signed up to compete in the dog show. There are 36 more small dogs than large dogs signed up to compete. How many small dogs are signed up to compete?”

Yes, this is that “new” math. This is the math that second graders will need to succeed as adults. Gone are the days when correctly completing 20 addition or subtraction problems is enough. Problem-solving and logical thinking is what employers are looking for. So, yes, this is a challenging problem, but not a problem we should be avoiding in our schools simply because the internet says it’s too hard.

I agree there is a flaw in this problem, but it’s not in the problem itself, it’s in the numbers that were chosen. Fortunately, the numbers are the least important part of solving a word problem. That stands worthy of repeating. The numbers are the LEAST important part of solving a word problem.

So, what is then? Visualization and comprehension!

Students need to visualize the problem and then represent it with models or pictures. This is why teaching bar modeling is so very important in the early grades.

Here’s a video that shows how easy it is to solve this problem if you focus on visualization first.

 

Any good teacher will follow up a lesson with practice, so here is your Word Problem Wednesday for February.

This problem was taken from Challenging Word Problems 2, a supplement to the Primary Mathematics series:

The total length of two ropes is 36 in. One rope is 4 in. longer than the other. What is the length of the longer rope?

Submit your solutions and we’ll post all interesting strategies.


The previous problem came from i-Excel Heuristic and Model Approach Primary 5 by Li Fanglan published by FAN-Math:

Bob’s Bikes sold 96 bikes during the week and 1/4  of what was left on the weekend. After that, Bob still had 1/2 of his bikes left. How many bikes did Bob have at first?

Dedicated readers submitted the following solutions, first an image from Shirley Davis:

And a video from Kristine Simonson, who has been using some of the problems with her fourth graders:

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About Beth Curran

I am a teacher, presenter, mentor and advocate of providing quality mathematics education to all students.

Comments

  1. Ellen Donovan says:

    Is there any hope here? Our two granddaughters will be with us for at least six weeks this summer. If we can get them back after we take a cruise, we will have them for another month. Although I was an English teacher, I am pitifully deficient in math. I was not required to take any math at the private university I attended! I can’t even figure out these Wednesday word problems.
    Unfortunately they have been attending low-performing public schools in FL. I am not certain the first grader will pass into second grade. I do not think she should. The other girl will be going into fourth grade. With this sketchy information do you think it wise for me to try to teach a new-to-them math program?

  2. Ellen Donovan says:

    Thanks, Cassie. So far I have been unable to get much information from the girls’ teachers, as I am not their parent. Getting permission from either parent proved to be a struggle. I will try again next week.
    Also I will continue to wrestle with these elementary math problems you have posted!
    Ellen

    • Ellen, You can always play games and check out Bedtime Math and Talking Math with your Kids. You might have the fourth-grader work through problems at Thinkingblocks.com as well.

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