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Dividing by Halving

Dividing by Halving. Chapter 9, Lesson 2 Grade 5 Mathematics. Dividing in Half. You probably believe that dividing a number by 2 is easy – am I right?. 4 ÷ 2 = ___ ÷ 2 = ___ 50 ÷ 2 = ___ 10,002 ÷ 2 = ____. That wasn’t too hard, was it?. Dividing in Half… Again.

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Dividing by Halving

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  1. Dividing by Halving Chapter 9, Lesson 2 Grade 5 Mathematics

  2. Dividing in Half You probably believe that dividing a number by 2 is easy – am I right? 4 ÷ 2 = ___ ÷ 2 = ___ 50 ÷ 2 = ___ 10,002 ÷ 2 = ____ That wasn’t too hard, was it?

  3. Dividing in Half… Again Would it also be simple to divide by 4or by 8? 24 ÷ 4 = ____ (that’s easy) 24 ÷ 8 = ____ (that’s also pretty easy) How about… 192 ÷ 8?

  4. Lauren’s Division (p.302) 56 ÷ 2 28 28 + ÷ 2 14 ÷ 2 14 14 14 + + + 7 7 + 7 + 7 + 7 7 + + 7 7 + + Each van will carry 7 students.

  5. Back to Our Question 192 ÷ 8 = ? I see that I have a dividend that is an even number (192). I can also see that my divisor is 8. Dividing by 8 is the same thing asdividing by 2three times in a row.

  6. Fill in the Boxes 192 ÷ 2 96 96 + ÷ 2 48 ÷ 2 48 48 48 + + + 24 24 + 24 + 24 + 24 24 + + 24 24 + + 192 ÷ 8 = 24

  7. Summarizing What We’ve Learned • Dividing by 2 is easy • When we see a division question with a divisor of 4 or 8, we can simply divide by 2 multiple times • BUT WHAT IF THE DIVISOR IS A 6?Almost the same thing, but watch closely. First, divide by 2, and then divide that answer by 3. OR First, divide by 3, and then divide that answer by 2.

  8. Example 18 ÷ 6 = ___ It’s an easy question, right? 18 ÷ 2 = 9 9 ÷ 3 = 3 Therefore, 18 ÷ 6 = 3. Was that easy?

  9. Need to See it Again? You can ask the teacher for Base Ten Blocks (the 1cm3 blocks). Borrow 18 blocks. Solve 18 ÷ 6 by first dividing by 2, and then by dividing that answer by 3. If you feel confident that you understand… Can you answer this?84 ÷ 6 = _?_

  10. Practice Questions Page 303 • Do questions 1 to 6

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