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**Dividing by Whole Numbers**

Lesson 3-8

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**In long division, we use both multiplication and division.**

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Key Vocabulary…

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**Parts of a division problem…**

GOES INTO quotient divisor ) dividend DIVIDED BY

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**To keep your long division steps in order, remember the basic family…**

DAD Divide the divisor into the dividend MOM Multiply the divisor by the factor you are about to put into your quotient SISTER Subtract the product from the dividend/difference BROTHER Bring down the next digit in your problem Rover Repeat or remainder

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**Writing the Division Problem…**

When you are thinking about lunch… I mean long division… think of In-and-Out.

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Example 1

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Example 1 Divide as with whole numbers but when I meet the decimal point in the dividend I add it in the quotient!! 6.6 -24 24 -

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Example 1 Check your answer. Multiply the quotient by the divisor. Your answer should be the dividend. 6.6 X 4 26.4

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**What do I do if I have zeroes in my problem?**

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**Yes. 2 times. Put the 2 over the 4 (my last underlined number)**

7 x 2 = 14 7 ) Does 7 go into 14? -14 Subtract 14-14= 0 Yes. 2 times. Put the 2 over the 4 (my last underlined number)

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**No. Put the 0 in the quotient over the 0 in the dividend.**

2 7 x 0 = 0 7 ) Does 7 go into 0 or 00? -14 Bring down the zero No. Put the 0 in the quotient over the 0 in the dividend. 0 – 0 = 0

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**No. Put the 0 in the quotient over the 2.**

7 x 0 = 0 7 ) -14 No. Put the 0 in the quotient over the 2. Bring down the 2 2 2 – 0 = 2 Does 7 go into 2? 2

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**Send up the decimal point.**

2 7 ) -14 Send up the decimal point. 2 2

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**Yes. 7 x 3 = 21. Put the 3 in the quotient over the 5.**

3 7 x 3 = 21 7 ) -14 Yes. 7 x 3 = 21. Put the 3 in the quotient over the 5. Bring down the 5 2 2 5 25 – 21 = 4 21 Does 7 go into 25? 4

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**Yes. 7 x 6 = 42. Put the 6 in the quotient over the 2.**

3 6 7 x 6 = 42 7 ) -14 Yes. 7 x 6 = 42. Put the 6 in the quotient over the 2. Bring down the 2 2 25 21 Does 7 go into 42? 42 – 42 = 0 4 2 42

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And the answer is… 2 3 6 7 )

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Let’s Practice…

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Now try these two. 42.8 2.61 How did you do?

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**Let’s try rounding to the nearest 10th.**

Look at the number to the right of the number in the 10ths place. If it is 0, 1, 2, 3, or 4, round down. If it is 5, 6, 7, 8, or 9, round up. .925 rounds to .9 3.467 3.5 26.45 26.5 4.01 4 325.23 325.2

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Practice Try 1) 25.2÷4= Answer: Did you get it 6.3? Try 2) 65.28÷12= hint: round to the nearest tenth first!! Answer: Did you get it 5.44?

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18.09 6 )

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151.08 11 )

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Thanks for attending

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