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Lesson 52

Lesson 52. Mentally Dividing Decimal Numbers by 10 and by 100. Notes. Mental Math. Links. Activity. Proficiency. Homework. Fact Test. Mental Math. Count by 12’s from 12 to 132 4 x 250 368 – 150 250 + 99 $15 + $7.50 ½ of 5 20 x 40 5 x 10, + 4, ÷ 6, x 8, + 3, ÷ 3.

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Lesson 52

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  1. Lesson 52 Mentally Dividing Decimal Numbers by 10 and by 100

  2. Notes Mental Math Links Activity Proficiency Homework Fact Test

  3. Mental Math • Count by 12’s from 12 to 132 • 4 x 250 368 – 150 • 250 + 99 $15 + $7.50 • ½ of 5 20 x 40 • 5 x 10, + 4, ÷ 6, x 8, + 3, ÷ 3

  4. When we divide by 10, the digits shift one place to the right. When we divide by 100, the digits shift two places to the right. • Although it is the digits that are shifting places, we produce the shift by moving decimal point. • When we divide by 10, the decimal point moves one place to the left. When we divide by 100, the decimal place moves two places to the left.

  5. Example #1 Divide 37.5 ÷ 10 Mentally shift the decimal point one place to the left. 3.75 3.75 ÷ 100 = Mentally shift the decimal point two place to the left. .0375

  6. http://www.math.com/school/subject1/practice/S1U1L3/S1U1L3Pract.htmlhttp://www.math.com/school/subject1/practice/S1U1L3/S1U1L3Pract.html http://www.funbrain.com/cgi-bin/tens.cgi?A1=s&A2=6&INSTRUCTS=1

  7. Activity Alcia averaged 88% on her first 3 tests. What score does she need on her fourth test to have a four-test average of 90%

  8. Lesson 52 Practice A-H Complete #’s 1-10

  9. Fact Test G

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