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**Mr. Gifford’s 5th Grade Math Lesson #19 **

Dividing by multiples of 10 and estimating Quotients

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**Division is the opposite of Multiplication**

Division is the opposite of Multiplication. In division you are DIVIDING objects into small EQUAL parts.

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**The first thing you have to do is estimate your division problem**

The first thing you have to do is estimate your division problem. This is very similar estimating for addition, subtraction, and multiplication.

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**Now lets look at the parts of a division problem.**

Quotient 9 Divisor 5 45 Dividend

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Look at this problem 5 36 5 40 Round 36 to 40. Keep 5 as it is.

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**Now ask yourself how many GROUPS of 5 does it take to make 40?**

Now add the groups of 5 together and you get 8 groups of 5 5 5 5 5

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So Will be close to 5 36 8 groups So when you divide you know your answer will be around 8 groups

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**Lets do another problem.**

Think back to your multiplication facts. What number times 7 is CLOSE 55? 7 55 8 : 7 x 8 = 56

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**Since 56 is Larger than 55 your answer CAN NOT be 8**

Since 56 is Larger than 55 your answer CAN NOT be 8. So it needs to be one LESS ; 7

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**So when you estimate you are trying to get as close to the larger number.**

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**Lets look how to divide using multiples of 10**

8 40 Use your multiplication table and think about what number times 8 = 40? How many GROUPS of 8 are in 40?

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8 X 5 = 40 Your Answer or QUOTIENT is 5

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Here is another one 6 30 How many GROUPS of 6 are in 30? Use your multiplication table and think about what number times 6 = 30?

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6 X 5 = 30 Your Answer or QUOTIENT is 5

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**Use the practice worksheet to practice.**

Good work and good luck!

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