Powers of 10
4600 ÷ 101=
460
Estimate the quotient by rounding first.
245 ÷ 5 =
20
Some fancy pens cost $0.60 each. Jimmy pays $20 and receives $8 back in change. How many pens did Jimmy buy?
20 pens
When dividing by powers of 10, which way do you always move the decimal?
Left
Solve
2,436 ÷ 4 =
609
4600 ÷ 102=
46
Estimate the quotient by rounding first.
96 ÷ 12 =
10
A coach puts 119 athletes into teams of 12 for a charity tournament. Extra players work as volunteers to referee. How many players work as referees?
11 players work as referees
If your divisor is a decimal what do you have to do before you solve the problem?
You need to move the decimal to the right in the divisor and dividend to make the divisor a whole number.
Solve
8.12 ÷ 14 =
0.58
34 ÷ 103=
.034
Estimate the quotient by rounding first.
4234 ÷ 26 =
113 with a remainder of 10
A rectangle has an area the is half of 336 ft2. If the width of the rectangle is 8 ft, what is the length?
(Use the formula: Area=Length x Width)
21 Feet
What is a power of 10? Give an example.
Anything that is 10x and an example of this is 102 or 109
Solve
0.48 ÷ 8 =
0.06
6.3 ÷ 101=
.63
Estimate the quotient by rounding first.
3010 ÷ 43 =
75
Work backward using the answers to solve this problem. The pet store received 200 lizards. The owner would like to put the same number of lizards in each tank. If the owner does this how many tanks will be used?
a. 12 b.24 c.18 d.25
d. 25 Tanks
What is the answer in a division problem called?
A Quotient
Solve
279.04 ÷ 64 =
4.36
6.3 ÷ 103=
.0063
Estimate the quotient by rounding first.
985 ÷ 49 =
20
A nonprofit organization sends 5 times as many blankets as pillows to families in need. The organization ships a lot of blankets. Pick a number that you think is a lot of blankets and show how you find the number of pillows that the organization ship.
Answers may vary.
If you are asked to "Estimate the quotient by rounding first" do you round the dividend and divisor before you solve?
Yes
Solve
238.98 ÷ 21 =
11.38