Representing 2-Step Word Problems with Strip Diagrams and Number Lines | 3rd Grade Math

Understanding Word Problems

• 🎯 The video focuses on representing 2-step word problems using strip diagrams and number lines for 3rd-grade math.
• 💡 The goal is to identify the correct visual model to solve problems involving addition and subtraction.

Example 1: Bakery Sales

• 🍪 A bakery sold 144 cookies, 308 cupcakes, and 180 loaves of bread.
• ❓ The question asks for the total number of items sold over the weekend.
• 📊 Choice B is identified as the correct strip diagram because it shows the quantities of cookies, cupcakes, and bread being added together to find the total.
• ❌ Other choices are incorrect because they misrepresent the relationship between the given numbers and the total sought.

Example 2: Bank Account Balance

• 💰 Diego starts with $700 in his bank account.
• 🛍️ He spends $186, which means the amount decreases.
• 🏦 The next day, he deposits $45, which means the amount increases.
• 📈 Choice B is the correct number line representation: starting at 700, moving down by 186 (spending), and then moving up by 45 (depositing).
• ⚠️ Incorrect number lines were ruled out for showing an increase when spending or a decrease when depositing.