1. Getting Started 2.6

2. Guiding Questions How can solving easier problems help us find the product of a multiplication problem? How can solving easier problems help us find the product of a multiplication problem? How can estimating products help us judge the reasonableness of an answer? How can estimating products help us judge the reasonableness of an answer?

3. Consider This We have been solving many multiplication problems by using several strategies. Today, let’s focus on the FIRST steps that lead to a different way to solve the problem. Consider this: 54 x 48 Solve this, and then instead of sharing how you solved the problem, share only what you did FIRST.. your first step.

4. Solving 54 x 48 First steps: First steps:

5. Solving 54 x 48 First steps: First steps:

6. Solve the following independently: SHOW YOUR WORK!! 30 x 2040 x 2039 x 10 Now choose one of the problems above as the first step to solving this problem: 39 x 26. 39 x 26. 33 x 100 30 x 50 10 x 55 Now choose on of the problems above as the first step to solving this problem: 33 x 55 47 x 10 40 x 30 10 x 36 Now choose one of the problems above as the first step to solving this problem: 47 x 36 6 x 15 100 x 15 106 x 10 Now choose one of the problems above as the first step to solving this problem: 106 x 15

7. Discussion 39 x 26 = 39 x 26 = First step: Second step: First step: Second step: A. 30 x 20A. A. 30 x 20A. B. 40 x 20B. B. 40 x 20B. C. 39 x 10C. C. 39 x 10C. Finish solving the problem, using one of those first steps and continuing on with second step, and so on until you have solved it. As you finish, share with your partner and think about the following: Can you read your partner’s work? Can you follow each other’s strategy on paper? Are any steps unclear? Can you make your solutions clearer?

8. Independent Work. Turn in when finished. 536 – 247 = 536 – 247 = 724 – 243 = 724 – 243 = 551 + 463 = 551 + 463 = 620 – 125 = 620 – 125 = _________ + 840 = 1,600 _________ + 840 = 1,600 ________ - _______ = 350 ________ - _______ = 350 ________ + _______ = 1,350 ________ + _______ = 1,350 800 - ____________ = 275 800 - ____________ = 275 Estimate: 28 x 12 = Estimate: 28 x 12 = Estimate: 43 x 27 = Estimate: 43 x 27 =

9. Guiding Questions How can solving easier problems help us find the product of a multiplication problem? How can solving easier problems help us find the product of a multiplication problem? How can estimating products help us judge the reasonableness of an answer? How can estimating products help us judge the reasonableness of an answer?