Subtraction

UEQ Compare and contrast the four main operations performed with numbers.

LEQ What are the key words for subtraction. Explain the concept behind subtraction.

Subtraction Subtraction means to take one amount from another amount to get a smaller total amount. When numbers are subtracted, the end result is a smaller number.

Vocabulary Difference: the answer in a subtraction problem Minus: the symbol/ sign for subtraction

Inverse Subtraction is the inverse, or opposite of addition. Therefore, addition and subtraction facts create fact families. You can use addition to check subtraction problems.

Drill See how many basic subtraction facts you already know by heart by completing this 5-minute drill. We are going to chart our progress with this drill each day. Do not start until the timer starts. http://themathworksheetsite.com/cgi-bin/subtract_5_minute.pl

Subtraction Shortcut Touch Math

Touch Math You can use Touch Math to subtract numbers quickly without using your fingers. In touch math, only the smallest number gets touch points. To subtract, you count backwards from the large number, touching all points on the smaller number.

Practice Use your touch points to add these problems together quickly. 5-1= 7-3= 4-2= 3-3= 8-1= 7-6= 9-4= 6-0= 9-2= 5-5= 8-3= 9-6=

Game! Subtraction Speed Grid http://www.oswego.org/ocsd-web/games/SpeedGrid/Subtraction/urikasub1res.html

Independent Practice Complete the following worksheet on your own for a daily grade. Remember: THERE IS NO TALKING http://www.softschools.com/math/worksheets/subtraction_worksheets.jsp

Day 2

Drill See how many basic subtraction facts you already know by heart by completing this 5-minute drill. We are going to chart our progress with this drill each day. Do not start until the timer starts. http://themathworksheetsite.com/cgi-bin/subtract_5_minute.pl

Multiple Digit Subtraction Without Regrouping Remember that “regrouping” means that we are going to be borrowing from our neighbor. Today, we are going to have big problems, but you are NOT going to have to regroup.

Practice 56 78 39 91 - 32 - 47 - 26 - 51 835 274 692 547 21 - 32 - 530 - 143 4278 7163 9495 6573 - 144 - 120 - 7423 - 2261

Game! Click on the UFO and match to its answer to uncover the Mystery Picture. http://www.dositey.com/addsub/mystery2S.htm

Independent Practice Complete the following worksheet on your own for a daily grade. Remember: THERE IS NO TALKING http://www.superteacherworksheets.com/subtraction/subtraction-5.pdf

Day 3

Regrouping Regrouping is the correct way of saying “borrowing.” We borrow/regroup when the top number in a subtraction problem is smaller than the bottom number. In other words, it is not enough.

Subtraction with Regrouping Step 1: Line up your numbers. Step 2: Subtract the ones column. Step 3: If the ones column cannot be subtracted, borrow one ten from the tens place. Step 4: Add the one ten to the ones place and subtract. 65 65 65 - 27 - 27 - 27

Borrowing When 2 Columns are 2-Digit Numbers Step 1: Line up your numbers. Step 2: Subtract the ones column. Step 3: If the ones column cannot be subtracted, borrow one ten from the tens place and add to the ones place. Step 4: Subtract the tens column. If the tens column cannot be subtracted, borrow one hundred from the hundreds place and ass to the tens place. Step 5: Subtract the hundreds column. 426 426 426 426 - 187 - 187 -187 - 187

Practice 34 62 75 46 - 19 - 27 - 38 - 58 356 423 464 508 - 236 - 168 - 389 - 192

Game! Subtraction Tic-Tac-Toe http://www.funbrain.com/cgi-bin/ttt.cgi?A1=s&A2=12&A3=0&INSTRUCTS=1

Independent Practice Complete the Independent Work sheet. Remember that this is to be completed on your own, and THERE IS NO TALKING http://www.superteacherworksheets.com/subtraction/subtract-regroup.pdf

Drill 6-minutes!! Ready, Set, Go!!!

Day 4

Drill 5-minutes!! Ready, Set, Go!!!

Regrouping Regrouping is the correct way of saying “borrowing.” We borrow/regroup when the top number in a subtraction problem is smaller than the bottom number. In other words, it is not enough.

Subtraction with Regrouping Step 1: Line up your numbers. Step 2: Subtract the ones column. Step 3: If the ones column cannot be subtracted, borrow one ten from the tens place and add to the ones place. Step 4: Subtract the tens column. If the tens column cannot be subtracted, borrow one hundred from the hundreds place and ass to the tens place. Step 5: Subtract the hundreds column…and so forth. 624 395 538 - 473 - 158 - 269

Practice/ Teachers? 234 467 325 448 - 119 - 227 - 138 - 356 234 467 325 448 - 119 - 227 - 138 - 356 387 458 464 508 - 236 - 163 - 389 - 192

Game! Subtraction Tic-Tac-Toe http://www.funbrain.com/cgi-bin/ttt.cgi?A1=s&A2=12&A3=0&INSTRUCTS=1

Independent Practice Complete the Independent Work sheet. Remember that this is to be completed on your own, and THERE IS NO TALKING http://www.superteacherworksheets.com/subtraction/dragon-subtraction.pdf

Day 5

Drill 5-minutes!! Ready, Set, Go!!!

Subtraction with Zeros Step 1: If the numbers below the zeros are bigger than the zero, you will have to borrow. To borrow, you must go over until you are at a number other then zero. Step 2: Borrow one from your number, add to the next zero to make 10. Step 3: Borrow one from the 10 (it becomes 9) and add it to the next 0 to make another 10. Step 4: Subtract to find the difference. 500 500 500 500 - 236 - 236 - 236 -236

Subtraction (Regrouping) with Zeros 500 700 600 400 - 370 - 149 - 164 - 278 600 800 - 357 - 426

Game! Answer each subtraction problem to become a millionaire. If you get an answer wrong, the game is over. http://www.quia.com/rr/10279.html

Independent Practice Complete the Independent Work sheet. Remember that this is to be completed on your own, and THERE IS NO TALKING http://www.superteacherworksheets.com/subtraction/subtract-regroup-zero.pdf