Okay, checking addition problems can be boring. Solving a math problem twice can be tedious. But finding the total weight of a group of family members can be hilarious, especially if your child is calculating and estimating the weight of diverse group of subjects, like an 8 lb. cat, a 22 lb. toddler, and a 180 lb. grandpa!
This hands-on activity gives your child an opportunity to apply various strategies to solve a problem and to check if his answer “makes sense.” Plus, it’s a great way for family members to help your child solve a “weighty” problem.
What You Need:
- Bathroom scale
- Family members
What You Do:
- Have your child record the weight of several willing family members. Have a scale available, if needed. These family members can include parents, siblings, grandparents, aunt and uncles, cousins and pets.
- Ask your child to add up the weights of all the participants to find the total number of pounds the group weighs.
- Using estimation, have your child check to see if his calculated results are reasonable. Suggest to your child that he first estimate the weight of each individual to the nearest ten pounds or five pounds. This is especially important if the individual is a pet. Sometimes it’s hard for kids to estimate the weight of adults. If your child’s estimation is not reasonable, suggest a more reasonable number. Then ask him to add all of the estimated numbers together.
- Have your child compare his estimation to his calculation. Discuss the use of estimation to verify, or check, calculations. Give examples of how this tool can be helpful in real world situations. If you'd like to extend the activity, start thinking about multiplication and division. How many cats would weigh the same a grandpa? How many baby sisters would weigh the same as Dad? Having fun with the math, and with your family, too!
Sally is an experienced educator, with over 14 years of teaching experience. Over the last ten years she has created educational materials, including ancillary, textbook, and test items, for Grades K-8 for major educational publishers.