DIVISION ÷ HANDBOOK Desert Willow Family School Division: Level 1.1 – Problem 12 276 Build It Build and Write Answer with No Remainders Teacher’s Questions 1. What does this mean? Student’s Answer 1. (Listen to the student’s answers. They should come to the conclusion of how many groups of 12 are contained in 276. 2. Do you want to start by building 2. I want to start with 276 groups of 12 until you get to 276 or blocks and break them up do you want to gather 276 blocks into groups of 12. and break 276 into groups of 12? 3. Get your 276 blocks and move 3. (Student should gather 2 all the other blocks out of the way. hundred blocks, 7 ten sticks and 6 unit cubes.) 4. Can you build any groups of 12? 4. Yes (most students will be familiar with building “groups of” because of multiplication) 5. Can we make more groups of 12? 5. Yes. (Building a division (Guide student to use a hundred problem with the blocks is block and 2 ten sticks to make a built groups-of over and group of ten 12’s) the answer down because it is the inverse of multip.) 6. Can you lay your pencil on one group of 12? 6. (Student should be able to identify the groups of 12 by laying their pencil on each row of 12 and counting down to find out how many groups of 12 were created. 23 12 276 7. How many 12’s are contained in 7. Twenty three 276? That is your answer….23 8. Can you lay your pencil on the 12 8. (Student should lay pencil groups of 23? to count out the 23 groups.) Division: Level 1.2 – Problem 11 168 Build It Build and Write Answer With Remainders Teacher’s Questions 1. What does this mean? Student’s Answer 1. (Listen to the student’s answers. They should come to the conclusion of how many groups of 11 are contained in 168. 2. Do you want to start by building 2. I want to start with 168 groups of 11 until you get to 168 or blocks and break them up do you want to get 168 blocks and into groups of 11. break 168 into groups of 11? 3. Get your 168 blocks and move 3. (Student should gather 1 all the other blocks out of the way. hundred block, 6 ten sticks and 8 unit cubes.) 4. Can you build any groups of 11? 4. Yes (students should be familiar with building “groups of” from multip.) 5. Can we make more groups of 11? 5. Yes. (Guide student to use hundred block and one ten stick to make a group of ten 11’s) 15 r 3 168 6. Can you lay your pencil on one group of 11? 6. (Student should be able to identify the groups of 11 by laying their pencil on each row of 11 and counting down to find out how many groups of 11 were created. 7. How many 11’s are contained in 7. Fifteen 168? That is your answer. 11 8. How many blocks are remaining? 8. Three 9. Can you build anymore groups of 9. No. 11? That is the remainder. Division: Level 2 – Connect the Blocks to the Long Method Algorithm Problem Build It Teacher’s Questions Student’s Answer 1. If there is an answer in the hun- 13 168 1300 dreds place, you would be building 1300’s, so we ask…..Could you build 100 groups of 13 which is…..? 1. 1300 x 13 168 1300 2. Are there any groups of 1300 in 168? ….so we place an X in the 100’s place value. 1300 130 3. If there is an answer in the tens x 13 168 4. Can you build a 10-group of 13 with 168 blocks? x1 13 168 1300 130 x1 13 168 -130 38 x1 168 - 130 38 place, you would be building 130’s, so we ask….Could we build 10 groups of 13, which is……? 2. No. We don’t have enough blocks. 3. 130 4. Yes, you can build one. (Student uses blocks to build 10 x 13.) 5. We have used 130 blocks to 1300 130 build our 10-group, so do we have them to build with anymore?..... 5. No so we have to subtract them away. 6. Now how many blocks do we have to build with now? 6. 38 1300 130 13 7.If there is an answer in the ones place, you would be building 13’s, so we ask…Could we build any 1 groups of 13, which is…..? 7. 13 8. How many 1-group of 13’s can you build? 8. Two Division: Level 2 – Connect the Blocks to the Long Method Algorithm (……Continued) Problem Build It Teacher’s Questions 9. Do we have these blocks to use to build with anymore? Student’s Answer 9. No x 12 13 168 -130 38 1300 130 13 10.What should we do to show that we don’t have them to build with anymore? 10. Subtract them away. - 26 12 11. Now how many blocks are left to build with? x1 2 13 168 -130 38 - 26 12 1300 130 13 11. Twelve 12. Can we make any more groups of 13? 12. No….that is the remainder. Division: Level 3 – Practicing the Long Method Algorithm WITHOUT Blocks into the THOUSANDS Problem Teacher’s Questions Student’s Answer 1. If I built a 1000 group of 25, it would be 25 4,234 25,000 25 with how many zeros? 1. Three which is…..? 2. Do you have any groups of 25,000 in the number 4,234? x 25 4,234 …..25,000 2. No. 3. How should we show that on the problem? 3. Place an X over the 25,000 x thousands place value. 4. Now where do we go in the problem? 4. The next place value over….the hundreds. 5. What is our next group of 25 to build? 5. 2500 6. Do you have any groups of 2500 in 4234? 6. Yes, 1 group of 2500... 25 4,234 x 25 4,234 25,000 2,500 7. How should we show we have created this x1 25 4,234 - 2,500 1,734 25,000 2,500 group and don’t have this amount to build with anymore? 8. Now where do we go in the problem? 7. Subtract 2500 from 4,234 8. To the next place value…..the tens place. x 1 25 4,234 - 2,500 1,734 25,000 2,500 9. What is our next group of 25 to build? 9. 10 x 25 = 250 10. Do we have any groups of 250 in our remaining 1,734? x16 25 4,234 - 2,500 1,734 25,000 2,500 250 10. Yes, six….. 250 x 6 = 1,500 11. What must we do to show that we have created these groups of 250 and don’t have this amount to build with anymore? 11. Subtract 1,500 from 1,734 - 1,500 234 Division: Level 3 – Practicing the Long Method Algorithm WITHOUT Blocks into the THOUSANDS (continued) Problem Teacher’s Questions Student’s Answer x16 25 4,234 - 2,500 1,734 - 1,500 234 25,000 2,500 250 25 12. Now where do we go in the problem? 12. To the ones place value 13. What is our next group of 25 to build? 13. 1 x 25 = 25 14. Do we have any groups of 25 in our remaining 234? 14. Yes, 9 x 25 = 225 15. What must we do to show that we have created these 9 groups of 25 and don’t have them to build with anymore? 234 x 169 25 4,234 - 2,500 25,000 1,734 2,500 250 - 1,500 25 234 - 225 9 15. Subtract 225 from 16. Can we build any more groups of 25? 16. No, so the remainder is nine. Division: Level 4 – Practicing the Long Method Algorithm WITHOUT Blocks into the TEN THOUSANDS Problem Teacher’s Questions Student’s Answer 1. If I built a 10,000 group of 25, it would be 25 58,147 250,000 25 with how many zeros? 1. Four which is…..? 2. Do you have any groups of 250,000 in the number 58,147? x 25 58,147 …..250,000 2. No. 3. How should we show that on the problem? 3. Place an X over the ten 250,000 x thousands place value. 4. Now where do we go in the problem? 4. The next place value over….the thousands. 5. What is our next group of 25 to build? 5. 25,000 6. Do you have any groups of 25,000 in 6. Yes, 2 groups of 25,000 25 58,147 x 25 58,147 250,000 25,000 because 2x25,000= 50,000 7. How should we show we have created these x2 25 58,147 - 50,000 8,147 58,147? 250,000 25,000 groups and don’t have this amount to build with anymore? 7. Subtract 50,000 from 58,147 8. Now where do we go in the problem? 8. To the next place value… the hundreds place. 250,000 25,000 9. What is our next group of 25 to build? 9. 100 x 25 = 2500 2,500 10. Do we have any groups of 2500 in our remaining 8,147? x 2 25 58,147 - 50,000 8,147 x23 25 58,147 - 5 0,000 250,000 11. What must we do to show that we have 25,000 created these groups of 2500 and don’t have 10. Yes, three….. 2500 x 3 = 7,500 11. Subtract 7,500 from 8,147 - 7,500 647 2,500 this amount to build with anymore? 8,147 Division: Level 4 – Practicing the Long Method Algorithm WITHOUT Blocks into the TEN THOUSANDS Problem (continued) Teacher’s Questions Student’s Answer 250,000 12. Now where do we go in the problem? 25,000 2,500 13. What is our next group of 25 to build? 12. To the tens place value x23 25 58,147 - 50,000 8,147 - 7,500 647 250 14. Do we have any groups of 250 in our remaining 647? 13. 10 x 25 = 250 14. Yes, 2 x 250 = 500 15. What must we do to show that we have created these 2 groups of 250 and don’t have them to build with anymore? 15. Subtract 500 from 647 x 2 32 25 58,147 - 50,000 8,147 - 7,500 647 - 500 147 - 125 22 250,000 25,000 2,500 250 25 16. Now where do we go in the problem? 16. To the ones place value 17. What is our next group of 25 to build? 17. 1 x 25 = 25 18. Do we have any groups of 25 in 147? 18. Yes, five…5 x 25 = 125 19. What must we do to show that we have created these 5 groups of 25 and don’t 19. Subtract 125 from 147 have them to build with anymore? 20. Can we build any more groups of 25? 20. No, so our remainder is 22 Division: Level 5 – Practicing the Long Method Algorithm WITHOUT Blocks with ZEROS in the DIVIDEND Problem Teacher’s Questions Student’s Answer 1. If I built a 10,000 group of 25, it would be 25 50,102 250,000 25 with how many zeros? 1. Four which is…..? 2. Do you have any groups of 250,000 in the number 50,102? x 25 50,102 …..250,000 2. No. 3. How should we show that on the problem? 3. Place an X over the ten 250,000 x thousands place value. 4. Now where do we go in the problem? 4. The next place value ….the thousands. 5. What is our next group of 25 to build? 5. 25,000 6. Do you have any groups of 25,000 in 6. Yes, 2 groups of 25,000 25 50,102 x 25 50,102 250,000 25,000 250,000 25,000 - 50,000 102 25 50,102 - 50,000 with anymore? 8. Now where do we go in the problem? 250,000 25,000 2500 250 x 20 groups and don’t have this amount to build 7. Subtract 50,000 from 50,102 x2 25 50,102 ….. 2x25,000= 50,000 7. How should we show we have created these x2 25 50,102 - 50,000 102 50,102? 8. To the next place value… the hundreds place. 9. What is our next group of 25 to build? 9. 100 x 25 = 2500 10. Do we have any groups of 2500 in our remaining 102? 10. No 11. So how do we show on our problem that we can make ZERO groups? 11. By putting a zero 250,000 25,000 12. Do we have anything to subtract off? 12. No 102 2,500 Division: Level 5 – Practicing the Long Method Algorithm WITHOUT Blocks with ZEROS in the DIVIDEND Problem (continued) Teacher’s Questions Student’s Answer 250,000 12. Now where do we go in the problem? 25,000 2,500 13. What is our next group of 25 to build? 12. To the tens place value x20 25 50,102 - 50,000 102 250 14. Do we have any groups of 250 in our remaining 102? 13. 10 x 25 = 250 14. No 15. What must we do to show that we can create ZERO groups of 250? 15. Place a zero again. 16. Now where do we go in the problem? 16. To the ones place value 17. What is our next group of 25 to build? 17. 1 x 25 = 25 x 2 00 25 50,102 - 50,000 102 250,000 25,000 2,500 250 25 x 2 004 25 50,102 - 50,000 102 - 100 2 250,000 25,000 2,500 18. Do we have any groups of 25 in 102? 18. Yes, four…4 x 25 = 100 19. What must we do to show that we have created these 4 groups of 25 and don’t have them to build with anymore? 19. Subtract 100 from 102 20. Can we build any more groups of 25? 20. No, our remainder is 2 Division: Level 6 – Side by Side Method to Move Students from Long Method to Short Method Long Method Algorithm Short Method Algorithm 25 8,422 25 8,422 Teacher: Can you build a 1,000-group of 25? 1000 x 25 = 25,000 Teacher: Does 25 go into 8? Student: No Teacher: What are you dividing at this step? Student: 25,000 into 8,000 Teacher: What are you doing on the right? Student: 25 into 8 Teacher: Let’s place our x and move on…. x 25 8,422 Teacher: Can you build a 100-group of 25? 100 x 25 = 2500 Student: Yes….three times…. 3 x 2500 = 7500 x 3 25 8,422 - 7,5 00 922 25 x 8,422 Teacher: Does 25 go into 84? Student: Yes, three times…. 3 x 25 = 75 x3 25 8,422 -75 9 Teacher: Can you build a 10-group of 25? 10 x 25 = 250 x3 25 8,422 - 7,5 00 922 Teacher: Bring down the 2 Student: Yes….three times… 3 x 250 = 750 Teacher: Does 25 go into 92? Student: Yes, three times… 3 x 25 = 75 x33 25 8,422 -75 25 x 33 8,422 - 7,5 00 x 3 25 8,422 -75 92 922 - 750 1 72 Division: Level 6 – Side 92 - 75 17 by Side Method to Move Students from Long Method to Short Method …..(continued) Long Method Algorithm Teacher: Can you build a 10-group of 25? 10 x 25 = 250 x 33 25 8,422 - 7,5 00 922 - 750 1 72 Short Method Algorithm Teacher: Now you bring down the 2…. x33 25 8,422 -75 92 - 75 17 2 (Notice how both problems now mirror each other when you get to the ones place value.) Student: Yes….seven times… 7 x 25 = 150 25 x337 8,422 - 7,5 00 922 - 750 1 72 - 1 5 0 22 Student: The final answer is 337 with a remainder of 22. Teacher: Does 25 go into 172? Student: Yes, seven times… 7 x 25 = 150 x33 25 8,422 -75 92 - 75 17 2 - 1 5 0 2 2 Division: Level 7 – Practicing the Short Cut Algorithm Problem 25 2,605 Teacher’s Questions Student’s Answer 1. Does 25 go into 2? 1. No 2. What do you do? 2. Put an X 3. Does 25 go into 26? 3. Yes, once….1x25 =25 4. How do we show that in the problem? 4. Place a 1 over the hundreds place value and subtract off 25. Now bring down the 0. 5. Does 25 go into 10? 5. No, so I put a zero over the x 25 2,605 x 25 2,605 x 1 25 2,605 - 25 10 25 x10 2,605 - 25 down the 5. 1 05 25 x104 2,605 6. Does 25 go into 105? 6. Yes, 4x25 = 100. 7. How do we show that in the problem? 7. Place a 4 over the ones place value and subtract off 100. - 25 1 05 - 1 0 0 5 tens place value and bring 8. What is the answer? 8. I can make 104 groups of 25 with a remainder of 5. Division: Level 8 – The Super Short Cut Algorithm (when Dividing with a Single-Digit Divisor) Problem Teacher’s Questions 4 5936137 1 Student’s Answer 1. Does 4 go into 5? 1. Yes, 1 time with 1 left over. 2. Carry the left over 1 in front of 4 51936137 14 the 9 to make it 19. 3. Does 4 go into 19? 3. Yes, 4 times with 3 left over. 4 519336137 4. Carry the left over 3 in front of the next number which is the 3. 5. Does 4 go into 33? 5. Yes, 8 times with 1 left over. 1 4 8 4 5193316137 6. Carry the left over 1 in front of the next number, which is the 6. 7. Does 4 go into 16? 1 4 8 4 0 4 5193316137 4 1 4 8 403 5193316137 1 4 8 4 8.Since there is nothing to carry over, just ask “Does 4 go into 1?” 9. Now we didn’t use that 1, so we ask “How many 4’s are in 13?” 8. No, so we put a zero on top. 9. Three because 3x4 = 12 with 1 remaining, so we put the remainder next to the 7. 403 519331613 17 7. Yes, 4 times with 0 left over. 10. Does 4 go into 17? 10. Yes, 4 times with 1 left over. 4 1 4 8 4 0 3 4 r1 The answer is 1,484,034 r1. 519331613 17 Division: Level 8 – Types of Division Word Problems Type of Problem Sample Word Problem Contained In Suzie has 200 yards of fabric to make quilts. Each quilt requires 25 yards of fabric to complete. How many quilts will she be able to make? Holds How many nets will the soccer coach need to purchase, if the team owns 24 soccer balls, and each net can hold 6 balls? Remainder Matters If the soccer coach want to carry all of the soccer balls in nets, how many nets will the soccer coach need to purchase, if the team owns 26 soccer balls, and each net can hold 6 balls? Average For the last three dictations, Sam has scored the following scores: 70, 70, 90, 50. What is Sam’s average score? Rate (per) Between the years 2003 and 2008, 90 students have graduated from Desert Willow. What is the average yearly rate of graduation? What is the dollar per mile amount, if a truck driver drives 100 miles for a fee of $1000. Division: Level 9 – Timed Tests for Division Facts Type of Problem Sample Fact Problem (60 problems in 3 minutes) Exact 12 ÷ 4 = _____ Student produces exact answer: 3 Non-Exact Fact 13 ÷ 4 = _____ Student produces closest answer: 3 Non-Exact Fact with a 13 ÷ 4 = _____ Student produces answer with the remainder: 3 r 1 remainder
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