** Divide Decimals**

We will divide decimals by whole numbers:

**Examples:**

You can divide decimals as you would whole numbers: Dumb Monkey's Smash Bananas (Divide, Multiply, Subtract, Bring down).

**Step 1:** Place the decimal point directly above the decimal point in the dividend.

**Step 2:** Divide 3 into 7. 3 can go into 7 two times.

**Step 3:** Multiply 3 x 2=6.

**Step 4:** Subtract 7-6=1

**Step** **5**: 3 cannot go into 1, so we have to bring down the 5.

**Step 6:** Repeat DMSB until you get a zero remainder or when you notice a repeating pattern. Divide 3 into 15.

** Step 7:** 3 can go into 15 five times.

** Step 8:** Multiply 3 x5=15

** Step 9:** We have a zero remainder so our answer is 2.5

Next, we will divide decimals by decimals:

**Step 1:** When multiplying a decimal by a decimal you need to change the divisor to a whole number. We need to move the decimal point all the way to the right. In this problem, we only need to move the decimal point in the divisor one place to the right to make it a whole number.

**Step 2:** We also need to move the decimal place in the dividend one place to the right.

**Step 3:** Divide the same way as you would with whole numbers.

**Step 4:** Place the decimal point directly above the decimal point in the dividend.

** Step 5:** Use DMSB.34 can not go into 6. Place a zero directly above the 6.

**Step 6:** Now we have to divide 34 into 68. 34 can go evenly into 68 two times. Place a 2 directly above 8 in the dividend.

**Step 7**: We have to multiply 34 x2 which gives us 68. Place 68 directly under the dividend.

**Step 8:** Subtract 68-68 which gives us a remainder of 0. We can go no further so our answer is 0.2

**Dividing Decimals Activity: Division Match-Up**

After students complete their daily assignment you can have them complete this short activity. You can use 10 index cards to place the problems and 10 index cards to place the answers and mix them up before handing to your student's.You can even customize the cards based on your students needs.

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Created by Wanda Collins May 10, 2015 at 1:56pm. Last updated by Wanda Collins May 10, 2015.

Question: Why is this a mathematical limerick?

( (12 + 144 + 20 + 3 Sqrt[4]) / 7 ) + 5*11 = 9^{2} + 0 .

Answer:

A dozen, a gross, and a score,

plus three times the square root of four, divided by seven, plus five times eleven, is nine squared and not a bit more.

---Jon Saxton (math textbook author)

**Presentation Suggestions:**

Challenge students to invent their own math limerick!

**The Math Behind the Fact:**

It is fun to mix mathematics with poetry.

**Resources:**

Su, Francis E., et al. "Math Limerick." Math Fun Facts.

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