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February 27, 2014 6:00-7:15 Agenda Videos Three Types of Bar Models Steps to Solving Bar Model Problems Sample Bar Model Problems On-line resource Think Central Practice What are bar models and why are they so important? Bar Models provide a useful pictorial representation of sets and parts making up a whole Children use bar models to illustrate a problem, indicating the known and unknown parts or the whole Bar Models help students make sense of the relationship between values given in real-world problems 2nd/3rd Grade Word Problems 4th/5th Grade Multiplication and Division with Bar Models Part Part Part/Part/Whole Comparison Equal Parts Step 1 – Read the problem without numbers. Mrs. Smith has ___apples. Later she gets ___more apples. How many apples does she have in all? Step 2 – Read the problem with numbers. Mrs. Smith has 3 apples. Later she gets two more apples. How many apples does she have in all? Step 3 – Decide which bar model to use. This is problem tells me 2 parts and asks me to find the whole, so I need to use a Part/Part/Whole bar model. Step 4- Decide where the ? goes. ? Step 5 – Plug in the numbers. 3 2 ? Step 6 – Solve it 3+2=5 Step 7 – Report your answer in a sentence. Mrs. Smith had 5 apples in all. Step 8 - Check your work. 5 - 2 = 3 or 5 – 3 = 2 Bar Modeling Grade 2 In Mrs. Anderson’s class there are twice Which Bar as many boys as girls. (2nd Grade) Model is this? Girls Boys There boys. How Howmany manyboys girls are are there? there? Thereare are18 6 girls. 3 ? Write a number sentence to match your picture. Students have to determine which part to solve first. Figuring out 2nd, 3rd or 4th parts to the problem are determined by whether or not they get the 1st step done correctly. Bar models can show them what they don’t know. 22 lbs 17 lbs Suitcase 1 ? Suitcase 2 ? Lisa had 175 stamps. Mia had 129 stamps. Lisa gave some to Mia and now Mia has 3 times as many. How many does Lisa have now? What if I used a bar model to help see the problems? ? Lisa ? Mia What if I used a bar model to help see the problems? ? Part 1) 175+129=304 Part 2) 304 4= Lisa Mia Lisa had __ stamps now. ? The cost of 3 pair of socks and 4 T-shirts is $132 Each T-shirt costs twice as much as a pair of socks. What is the cost for 1 pair of socks? What is the cost for 1 T-shirt? The cost of 3 pair of socks and 4 T-shirts is $132 Each T-shirt costs twice as much as a pair of socks. What is the cost for 1 pair of socks? What is the cost for 1 T-shirt? ? Socks ? T-Shirts $132 Each bar represents 1 piece to the problem. Socks To find the solution Divide the total by the number of bars. 132 divided by 11 equals 12. So the cost of 1 T-Shirts pair of socks is $12 and the cost of 1 Tshirt is $24. ? ? $132 www.thinkcentral.com Teachers can post assignments and test scores Students can access Student book Student workbook Virtual manipulatives Student interactivities Lesson videos • Videos with a description of each chapter’s content • Parent Support Videos with ‘at home’ suggestions