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Unit 7, Lesson 15 Explore Dividing by Two-Digit Whole Numbers

Unit 7, Lesson 15 Explore Dividing by Two-Digit Whole Numbers. Where do I write the first digit of the quotient?. Above the ones place 6 51 Above the hundreds place 9 7,413 Above the thousands place 7 8,293. Key Vocabulary.

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Unit 7, Lesson 15 Explore Dividing by Two-Digit Whole Numbers

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  1. Unit 7, Lesson 15Explore Dividing by Two-Digit Whole Numbers

  2. Where do I write the first digit of the quotient? Above the ones place 6 51 Above the hundreds place 9 7,413 Above the thousands place 7 8,293

  3. Key Vocabulary Estimate : tell about how much or about how many; make a thoughtful guess Ex. 476 Is 476 closer to 400 or 500? So I would estimate 476 to be about 500 We are going to use estimation to help us divide by two-digit whole numbers.

  4. Let’s solve this problem…. There are 2,048 sheep being sent on a train. Each railroad car holds 32 sheep. To find out how many railroad cars are needed for the sheep, divide 2,048 by 32.

  5. Digit-by-Digit Method of Dividing Step 3 6 32 2,048 (30) - 192 128 Multiply and subtract. Bring down 8 ones. Step 1 2,048 (30) Round the divisor Step 2 6 32 2,048 (30) Estimate the first digit. 30 goes into 200 about 6 times. Step 4 64 32 2,048 (30) - 192 128 - 128 0 Estimate the next digit and multiply.

  6. Expanded Notation Step 3 60 32 2,048 (30) - 1,920 128 Multiply and subtract. 60 x 32 = 1,920. Step 1 2,048 (30) Round the divisor Step 2 60 32 2,048 (30) Estimate the first digit. 30 goes into 2,000 about 60 times. Step 4 4 60 32 2,048 (30) - 1,920 128 - 128 0 64 Estimate the next digit and multiply.

  7. Rectangle Sections 60 32 (30) 2, 048 Round the divisor and estimate the first number. 60 32 2,048 (30) - 1,920 128 Multiply and subtract. 60 + 32 2,048 128 (30) –1,920 128 Make a new section 60 4 32 2,048 128 (30) –1,920-128 128 0 Estimate the next number, and multiply and subtract.

  8. Turn to page 308 in your hard back book!

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