Subtracting with Regrouping.ppt
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The document outlines a math lesson for 3rd graders in Indiana focused on subtraction with regrouping. It provides a step-by-step guide on how to solve problems involving borrowing from tens and explains the process with examples. The emphasis is on understanding place value and how to properly regroup numbers during subtraction.
Subtracting with Regrouping.ppt
- 1. Subtraction with Regrouping 3rd Grade Indiana Math Standard 3.2.1
- 2. 7 2 Name 6 4 8 3 3 1 6 0 4 2 2 5 7 3 8 2 7 5 2 1 9 3 5 0 7 1 4 3 9 1 2 0 5 2 3 3 6 2 9 4 3 2 4 4 7 0 Directions: For each problem, roll two dice. Write each number you roll in a box then solve.
- 3. 7 2 3 4 You can’t take 4 from 2 so you must regroup the 72.
- 4. 7 2 Let’s just think about the 72 for a minute. Remember the place value columns. tens ones Put 72 in expanded form: 70 + 2 You can borrow 10 from the 70 and give it to the 2 and still have 72. 7 0 6 0borrow 10 1 22 give 10 7 27 2 + +
- 5. Now let’s get back to the original problem. 7 2 3 4 You can’t take 4 from 2 so you must regroup the 72. 6 Borrow 1 ten from the 7. 12 Give the 1 ten to the 2 to make 12. Now subtract. 3 8 Let’s read the completed problem: 72 – 34 = 38 Remember you’re actually taking 10 from 70
- 6. 4 5 You can’t take 5 from 4 so you must regroup the 64. 6 5 Borrow 1 ten from the 6. 414 Give the 1 ten to the 4 to make 14. Now subtract. 1 9 Let’s read the completed problem: 64 – 45 = 19 Remember you’re actually taking 10 from 60
- 7. 313 Give the 1 ten to the 3 to make 13. 8 7 Borrow 1 ten from the 8. 2 6 You can’t take 6 from 3 so you must regroup the 83. Now subtract. 5 7 Let’s read the completed problem: 83 – 26 = 57 Remember you’re actually taking 10 from 80