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Subtraction with Regrouping

Subtraction with Regrouping. Mrs. Walker 4 th Grade. Difference. The answer to a subtraction problem!. 100 – 25 = 75. Inverse Operations. Opposite operations. This means that one operation undoes the other. Example: Addition and Subtraction. 100 – 25 = 75 75 + 25 = 100.

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Subtraction with Regrouping

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  1. Subtraction with Regrouping Mrs. Walker 4th Grade

  2. Difference The answer to a subtraction problem! 100 – 25 = 75

  3. Inverse Operations Opposite operations. This means that one operation undoes the other. Example: Addition and Subtraction 100 – 25 = 75 75 + 25 = 100

  4. Subtraction Rules • When you subtract 0 from any number, the result is the number. 6-0=6 4-0=4 2. When you subtract any number from itself, the result is 0. 6-6=0 5-5=0

  5. 3 4 7 2 You can’t take 4 from 2 so you must regroup the 72.

  6. borrow 10 7 0 6 0 + 2 give 10 1 2 + 7 2 7 2 tens ones Let’s just think about the 72 for a minute. 7 2 Remember the place value columns. 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. Borrow 1 ten from the 7. Give the 1 ten to the 2 to make 12. 6 \ 12 3 4 7 2 Remember you’re actually taking 10 from 70 Now let’s get back to the original problem. You can’t take 4 from 2 so you must regroup the 72. 3 8 Now subtract. Let’s read the completed problem: 72 – 34 = 38

  8. Borrow 1 ten from the 8. Give the 1 ten to the 3 to make 13. 7 \ 13 2 6 8 3 Remember you’re actually taking 10 from 80 You can’t take 6 from 3 so you must regroup the 83. 5 7 Now subtract. Let’s read the completed problem: 83 – 26 = 57

  9. 5 9 6 7 1 2 3 9 - 7 2 8

  10. 8 6 9 2 1 4 3 7 - 2 5 5

  11. 1 1 7 1 5 2 8 6 5 1 , 8 6 8 - 1 9 7 9 ,

  12. Practice in your notes! • 3,214 - 957= • 4,275 - 1,345= • 1,542 – 481 = • 2,962 – 845 =

  13. What do we do if the numbers we need to subtract have a decimal point?

  14. Its easy! Follow these steps: Line up the decimal points and subtract the columns from right to left, regrouping as needed. Place a decimal point in the answer directly below the other decimal points.

  15. 5 9 . 6 7 1 2 . 3 9 - . 7 2 8

  16. Subtraction Words DifferenceFewer How many moreHow much more LeftLess Minus Remains SubtractWere Not Words ending with “-er” (higher, longer, faster, heavier, larger, shorter, slower, farther, etc.) Example: Jean's apple weighs 100 grams, and Karen's apple weighs 80 grams. How much heavier is Jean's apple?

  17. Word Problem Practice: Mr. Tyson flew 1,224 miles in May and he flew 2,145 miles in June. How many more miles did he fly in June than in May? 2,145 1,224 921 Is this what you have on your paper? Now, you write a word problem requiring subtraction to solve it. -

  18. 7 2 7 0 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 Name Directions: For each problem, roll two dice. Write each number you roll in a box then solve.

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