1. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Two Digit Addition and Subtraction Parent Quick Smarts :Grade 1 Unit 9 Providing You the Smarts to Help Your Child Succeed

2. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Standard Algorithm 37 + 20 Use our understanding of numbers to add in a variety of ways 37 + 20 3 tens +2 tens = 5 tens or 50. Seven more than 50 is 57.

3. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy. Possible Addition & Subtraction Scenarios for First Graders Addition Within 100 - A two-digit number plus a one-digit number- A two-digit number plus a decade number Ex. 63 +8 Ex. 48+20 - A decade number plus a decade number- A two-digit number plus a two-digit number Ex. 30+40 Ex. 56+15 Subtraction – A decade number (10-90) from another decade number (10-90). Ex. 70-50

4. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Explore Addition and Subtraction Through: Hundreds Chart 30+28 Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy.

5. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Explore Addition and Subtraction Through: Hundreds Chart Models 30+28 Tens Ones Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy.

6. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Explore Addition and Subtraction Through: Hundreds Chart Models Open Number Lines 30+28 Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy.

7. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Open Number Lines Builds on relationships between numbers Strengthens understanding of place value and its connection to addition and subtraction. Improves mental math skills. Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy.

8. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Open Number Lines Develop own solution strategy. 49+32 495969817980 +10 +1 Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy.

9. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Open Number Lines Develop own solution strategy. 49+32 495060 81 7080 +10 +1 Florida Content Standard: Add within 100 using concrete models or drawings and strategies; subtract multiples of 10; explain the reasoning used for the strategy.

10. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Give the student the problem 68+8. Ask Could you do the problem without counting? Do you know what 8 + 8 is? Can that help you find 68 + 8? How could you use mental math to find the sum? What is the value of the digit _____? How could you decompose one of the addends to make the problem easier? What strategy did you use to solve the problem? How did it help you? Questions to Ask Your Child

11. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Real World Connections

12. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Real World Connections

13. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level Real World Connections

14. Click to edit Master text styles – Second level Third level – Fourth level » Fifth level See You Next Episode! Keep in communication with your child’s teacher. www.thinkcentral.com elementarymath.mysdhc.org