Dividing by Whole Numbers

1. Dividing by Whole Numbers Lesson 3-8

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

3. Key Vocabulary…

4. Parts of a division problem… GOES INTO quotient divisor ) dividend DIVIDED BY

5. 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

6. Writing the Division Problem… When you are thinking about lunch… I mean long division… think of In-and-Out.

7. Example 1

8. 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 24 - 0

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

10. What do I do if I have zeroes in my problem?

11. 2 ) 1402.52 7 x 2 = 14 7 Does 7 go into 14? -14 Subtract 14-14= 0 0 Yes. 2 times. Put the 2 over the 4 (my last underlined number)

12. 2 0 ) 1402.52 7 x 0 = 0 7 Does 7 go into 0 or 00? -14 0 0 Bring down the zero 0 0 No. Put the 0 in the quotient over the 0 in the dividend. 0 – 0 = 0

13. 2 0 ) 1402.52 0 7 x 0 = 0 7 -14 No. Put the 0 in the quotient over the 2. 0 0 Bring down the 2 0 0 2 2 – 0 = 2 0 Does 7 go into 2? 2

14. 2 0 0 ) 1402.52 7 -14 Send up the decimal point. 0 0 0 2 0 0 2

15. 2 0 0 3 ) 1402.52 7 x 3 = 21 7 -14 0 0 Yes. 7 x 3 = 21. Put the 3 in the quotient over the 5. 0 Bring down the 5 2 0 0 2 5 25 – 21 = 4 21 Does 7 go into 25? 4

16. 2 0 0 3 6 ) 1402.52 7 x 6 = 42 7 -14 0 0 Yes. 7 x 6 = 42. Put the 6 in the quotient over the 2. 0 Bring down the 2 2 0 0 25 21 Does 7 go into 42? 42 – 42 = 0 2 4 42 0

17. ) 1402.52 And the answer is… 2 0 0 3 6 7

18. Let’s Practice…

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

20. 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 .925 .9 3.5 3.467 26.45 26.5 4.01 4 325.23 325.2

21. 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?

22. ) 108.54 18.09 6

23. ) 1661.88 151.08 11

24. Thanks for attending