8 2 + 2 8 + ©Lakeshore Summary and Conclusion • Have students summarize what they learned. • The order of the addends does not affect the sum. Whenever the same two addends are used, the sum is always the same. This is called the commutative property of addition. Questions to Ask • What do you notice about 8 + 2 and 2 + 8? (The numbers are the same, but they are in a different order.) • What do you notice about the sums? (The sum of 8 + 2 is 10. The sum of 2 + 8 is 10. They’re the same.) • Does the order of the addends (the numbers being added) change the sum? (No, the order does not matter.) • Is this always true? How can you prove this? (Yes, it’s always true. I can add a different pair of numbers to test this.) • Try another pair of addition problems where the addends are the same. What do you find? (When you add two numbers, changing their order does not affect the sum. For example, 3 + 2 is 5 and 2 + 3 is also 5.) Try This • Draw a number line to show both problems. • Use a ten-frame and counters to model each problem. • Connect a set of number rods to model each problem. www.wintergreen.ca Teacher prompts on the back of each card make math discussions easy! EXPLAIN YOUR REASONING! MATH PROMPTS Challenge students to go beyond the right answer—and they’ll build problem-solving skills that will last a lifetime! Our math prompts get students thinking about how they arrived at an answer and how they can apply their strategy elsewhere. Each 81 ⁄2" x 11" prompt card features a challenging question on the front…flip it over and you’ll find a complete lesson outline, including an activity, teacher questions to facilitate learning, and the answer with concluding points. Each kit includes 50 grade-specific prompts—covering everything from operations and algebraic thinking to geometry—plus an activity guide with a reproducible student work space; in a storage box. PP671 ■ Grade 1 52.95 PP672 ■ Grade 2 52.95 PP673 ■ Grade 3 52.95 PP674 ■ Grade 4 52.95 PP675 ■ Grade 5 52.95 Shown: PP671 Grade 1 PP118X ■ MATH IN A FLASH! DISCOVERY CANS - GR. 4-5 - COMPLETE SET Students get targeted practice with place value, fractions, decimals, multiplication, division…and so much more! Packed with hands-on manipulatives and 25 step-by-step question cards, each skill-building math can includes everything children need to get focused practice with key math concepts. As students work through each can, they’ll use a protractor to measure angles, cubes to determine volume…and more. Plus, the self-checking question cards feature answers on back, so they’re perfect for independent practice. Set of 8 cans; each is 61 ⁄2" tall. 289.95 Each can is also available separately. PP416 ■ Volume (Shown.) 37.95 PP414 ■ Decimals 37.95 PP413 ■ Fractions - Level 1 37.95 PP411 ■ Fractions - Level 2 37.95 PP409 ■ Multiplication & Division 37.95 PP417 ■ Angles & Symmetry 37.95 PP415 ■ Measurement Conversion 37.95 PP412 ■ Place Value 37.95 25 illustrated cards guide students through each activity! Shown: PP416 Volume Grade Level 1 2 3 4 5 Grade Level 4 5 Math mastering basic skills 25