MCC 6 NS 3 Fluently add subtract multiply

MCC 6. NS. 3: Fluently add, subtract, multiply, and divide multi‐digit decimals using the standard algorithm for each operation. EQ: Which strategies are helpful when performing operations on multi‐digit decimals? Vocabulary: sum, difference, algorithm, subtrahend, minuend

Guided Practice • 67. 23+ 9. 3 + 0. 758= – Estimate and explain your estimation – Now compute the exact answer – What is a method you can use when adding decimals that you can use with any two numbers? • 67. 23‐ 9. 3‐ 0. 758= – Estimate and explain your estimation – Now compute the exact answer – What is a method you can use when subtracting decimals that you can use with any two numbers?

Keywords or phrases for adding/subtracting Adding 1. Add 2. Altogether 3. Both 4. In all 5. Sum 6. Total Subtracting 1. Difference 2. Fewer 3. How many more 4. How much more 5. Left 6. Less: 7. Minus 8. Need to 9. Remains 10. Subtract

Adding and Subtracting Decimals Algorithm New Vocabulary What are the steps? • Sum- answer to an addition 1. Write the problem vertically, lining up the • Difference- answer to a decimal points. subtraction problem 2. Add or subtract from right • Minuend- the number that is to to left be subtracted from. 3. Regroup if necessary. • Subtrahend- the number that is to be subtracted Example 1 Shelia and Leslie hiked 8. 76 kilometers in the morning and 4. 29 kilometers in the afternoon. How many kilometers did they hike in all? 13. 05 Example 2 A plumber has two metal pipes. The first pipe is 2. 35 meters long. The second pipe is 1. 725 meters long. How much longer is the first pipe than the second pipe?

Which is the minuend and which is the subtrahend? 67. 23 ‐ 9. 3 minuend What is the difference?