Choose a Method...Any Method

Choose a Method……. Any Method By: Teresa Henderson NC Competency and Objectives: • 1.06 Develop flexibility in solving problems by selecting strategies and using mental computation, estimation, calculators or computers, and paper and pencil multi-digit addition and subtraction through 9,999 • 1.02 (a,b,c) Develop fluency with Review Time! •SUM •DIFFERENCE •DIGIT •ESTIMATE Check yourself • Sum – The answer when you add. • Estimate – Find an answer that is close to the exact answer. • Difference – The • Digit – A number. answer when you subtract. (Example in the number 234 the symbol 2 is called a digit.) What is Mental Math? Mental Math -means doing mathematics in your MIND---in your head, without using paper and pencil. Use your MIND to solve the problems. Practice Makes Perfect! 4. 674 5. 1. 2. 786+656=? 837+123=? – 234=? 985 – 134=? 3. 983+325=? 6. 770 – 238=? Use Paper and Pencil to solve the problems. Practice Makes Perfect! 4. 674 5. 1. 2. 786+656=? 837+123=? – 234=? 985 – 134=? 3. 983+325=? 6. 770 – 238=? Use a Calculator to solve the problems. Practice Makes Perfect! 4. 674 5. 1. 2. 786+656=? 837+123=? – 234=? 985 – 134=? 3. 983+325=? 6. 770 – 238=? Mentally Estimate: Round each number to the greatest place. Practice Makes Perfect! 4. 674 5. 1. 2. 786+656=? 837+123=? – 234=? 985 – 134=? 3. 983+325=? 6. 770 – 238=? Use a Computer to solve the problems. Practice Makes Perfect! 4. 674 5. 1. 2. 786+656=? 837+123=? – 234=? 985 – 134=? 3. 983+325=? 6. 770 – 238=? Do you have any questions?