1. Dividing Decimals By Whole Numbers
CONFIDENTIAL

2. LET’S CHECK !!!
0.7 x 0.4 =0.28
21 ÷ 3 = 7
81÷ 9 =9
63 ÷ 7 =9
729 ÷ 81 =9
CONFIDENTIAL

3. Divide a decimal by a 1-digit number
Divide a decimal by a whole number is similar to dividing whole numbers
CONFIDENTIAL

4. Dividing decimals by a 1-digit number
Example-1
Find 6.8 ÷ 2 =
Estimate 6 ÷ 2 = 3
3.4
Place the decimal point directly above the decimal point in the dividend.
6.8
-6.0
0 8 8
Divide as with whole numbers
6.8 ÷ 2 = 3.4. Compared to the estimate, the quotient is reasonable.
CONFIDENTIAL

5. Example -2 45.9 1 5. 3 - 3 15 - 15 0 9 -9 Estimate 48 ÷ 3 = 16.
Divide 45.9 ÷ 3
Place the decimal point
45.9
- 3 15
- 15
0 9 -9 1 5. 3
Divide as with whole numbers
45.9 ÷ 3 = Compared to estimate, quotient is reasonable.
CONFIDENTIAL

6. Example-3 Find 3.49 ÷ 4 Estimate is 4 ÷4 =1 Place the decimal point 0.8 7 2 5
- 32 29
-28 10 -8 20
-20
Annex a zero and continue dividing.
3.49 ÷ 4 = Compared to the estimate, the quotient is reasonable.
CONFIDENTIAL

7. Let’s try by yourself
2.5 -6 15
-15
Find 7.5 ÷ 3
CONFIDENTIAL

8. Multiplying Decimals By a 2-Digit Number
Find 7.49 ÷ 14
0.535
Place the decimal point
Estimate is 10 ÷10=1
7.490
-70
0 49
- 42
070
- 70
7.49 ÷14 =
Compared to the estimate, the quotient is reasonable.
Annex a zero and continue
dividing
CONFIDENTIAL

9. Example -2 Place the decimal point 0.395 Find 8.69 ÷ 22. 22 8.690 -66
209
-198
0110
-110
Annex a zero and continue dividing.
CONFIDENTIAL

10. Now your turn
Find ÷ 14 = 8.2
CONFIDENTIAL

11. Practice Problems 2) 9.6 ÷2 = 4.8 1) 3.5 ÷ 7=0.5 3) 51.79÷3=17.2633
CONFIDENTIAL

12. More Problems 1) 11.4 ÷ 19=0.6 2) 10.22 ÷ 14=0.73 3) 212.8 ÷ 14=15.2
CONFIDENTIAL

13. Have a Break!!!
CONFIDENTIAL

14. Let’s have some fun
CONFIDENTIAL

15. More Practice Problems
1) ÷ 3=13.13
5) 55.2 ÷ 46= 1.2
2) 8.53 ÷ 6=
6) ÷ 31=10.862
3) 36.8 ÷ 2= 18.4
7) ÷ 25=30.048
8) ÷ 34=2.056
4) ÷ 5= 23.7
CONFIDENTIAL

16. Word Problems
Q: Britannia and 5 of her friends bought a six-pack of fruit juice after their lacrosse game. If the six-pack costs $3.29, how much does each person owe, if the cost is divided equally ?
A:$3.29÷6 = …………
CONFIDENTIAL

17. Review
♣ Dividing a decimal by a whole number is similar to dividing whole numbers.
CONFIDENTIAL

18. That's all for today.
We will meet soon.
CONFIDENTIAL