1. How do I compare? Unit Two Activity 3

2. 3 rd Grade GLE’s 1.Model, read, and write place value in word, standard, and expanded form for numbers through 9999 (N-1-E) 2. Read, write, compare, and order whole numbers through 9999 using symbols (i.e., ) and models (N-1-E) (N-3-E) 11. Add and subtract numbers of 3 digits or less (N-6-E) (N-7- E) 13. Determine when and how to estimate, and when and how to use mental math, calculators, or paper/pencil strategies to solve addition and subtraction problems (N-8-E) (N-9-E)

3. Big Idea !!! Addition is a way of putting things together to find out how many there are altogether. When you need to find out how many things you have you need to add. Addition is a way of putting things together to find out how many there are altogether. When you need to find out how many things you have you need to add.

4. Guiding Questions ??? Was it easier to use the calcUlator or is it easier to use MENTAL MATH and put the U back into the problem? Was it easier to use the calcUlator or is it easier to use MENTAL MATH and put the U back into the problem? When does a calculator really help? When does a calculator really help? Which method is better for which problem? Which method is better for which problem? Should U use a Calculator, Mental Math, or paper/pencil method to solve? Should U use a Calculator, Mental Math, or paper/pencil method to solve?

5. Calc U late ? With your face partner and Using the calculator create a three- digit number using three DIFFERENT DIGITS. With your face partner and Using the calculator create a three- digit number using three DIFFERENT DIGITS. Write your number down and let your partner create their three digit number using the calc U lator. Write your number down and let your partner create their three digit number using the calc U lator. Which number is larger using your knowledge of place value? Which number is larger using your knowledge of place value?

6. Find UR PLACE VALUE? After you and your partner have created several numbers set the numbers up in equalities. After you and your partner have created several numbers set the numbers up in equalities. For example 6,027 O 6,207. Place the,= signs in the circle. For example 6,027 O 6,207. Place the,= signs in the circle.

7. ESTIMATE YOUR PLACE? After your team has compared the three digit numbers then I want you to estimate (round) the sum. After your team has compared the three digit numbers then I want you to estimate (round) the sum. For example, 6207 For example, 6207 _+ 3,027 _+ 3,027 9,234 round this sum to the greatest place value? 9,234 round this sum to the greatest place value? The answer is 9,000.

8. Rollin on the River Before adding the sums roll the Dice to determine how you will solve the problem… Before adding the sums roll the Dice to determine how you will solve the problem… 1 or 2 on dice use mental math 1 or 2 on dice use mental math 3 or 4 use calculator 3 or 4 use calculator 5 or 6 use paper/pencil 5 or 6 use paper/pencil

9. EXPAND YOUR THINKING… Each team member may enter in a four digit number in the Cal U lator. Each team member may enter in a four digit number in the Cal U lator. Give your calculator to your face partner and they will write that number in expanded form or word name. Give your calculator to your face partner and they will write that number in expanded form or word name. Then switch roles one student writing and the other entering on the calculator. Then switch roles one student writing and the other entering on the calculator.