…..to our THIRD GRADE MATH CLASS! This PowerPoint was developed by Jessica Kresky and her Third Grade Team …..as we review some of the things that we’ve learned. Hoot if you’ve heard of number bonds. Not number bons… Not number bombs… Not nummer bonds… But number bonds. Number bonds show a relationship of numbers. GREAT JOB! Let’s begin. Mental Addition: Strategy One: Make a number bond. Use expanded form. Add the tens and then add the ones. Find 36 + 57 STUDENTS, TEACH IT! Mental Addition: Strategy One: Make a number bond. Use expanded form. Add the tens and then add the ones. Find 19 + 37 ADULTS, TRY IT! GREAT JOB! Let’s keep going! Mental Addition: Strategy Two: Make a number bond. Round up. Add the tens, then subtract the extra ones. Find 36 + 46 STUDENTS, TEACH IT! Mental Addition: Strategy Two: Make a number bond. Round up. Add the tens, then subtract the extra ones. Find 28 + 36 ADULTS, TRY IT! GREAT JOB! Let’s keep going! Mental Subtraction: Strategy One: Make a number bond using expanded form. Subtract the tens, then subtract the extra ones. Find 55 - 23 STUDENTS, TEACH IT! Mental Subtraction: Strategy One: Make a number bond using expanded form. Subtract the tens, then subtract the extra ones. Find 87-34 ADULTS, TRY IT! GREAT JOB! Let’s keep going! Mental Subtraction: Strategy Two: Make a number bond by rounding up. Subtract the tens, then add the extra ones. Find 72 - 37 STUDENTS, TEACH IT! Mental Subtraction: Strategy Two: Make a number bond by rounding up. Subtract the tens, then add the extra ones. Find 84-38 ADULTS, TRY IT! Ready? Aim for 100. More Mental Addition: Make a number bond by rounding up to 100. Add 100, then subtract the extra ones. Find 39 + 96. STUDENTS, TEACH IT! More Mental Addition: Make a number bond by rounding up to 100. Add 100, then subtract the extra ones. Find 18 + 98 ADULTS, TRY IT! GREAT JOB! Let’s keep going! Ready? This is going to be so COOL! More Mental Addition: Make number bonds by rounding to 100. Add the hundreds. Then, subtract the extra ones. Find 97 + 96. STUDENTS, TEACH IT! More Mental Addition: Make a number bond by rounding up to 100. Add 100, then subtract the extra ones. Find 97 + 99 ADULTS, TRY IT! GREAT JOB! Let’s stop!

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