Chapter 6 Jeopardy

Multiply Decimals

100

546 x 0.8 = 

436.8

200

9.8 x 4.5 = 

 44.1 

300

33.5 x 0.13 = 

4.355

400

3.845 x 8.7 =

33.4515

500

435.89 x 0.47 = 

204.8683

Powers of 10

100

12.09 x 100 = 

1,209

200

9.87 / 10^{3 =} 

^{*the / means divide*}

0.00987

300

Which way do you move the decimal when dividing by powers of ten? Which way do you move the decimal when multiplying by powers of ten? 

divide = left

multiply = right

400

467.2 / 10³ / 10 = 

0.04672

500

546.2334 x 10 x 10² = 

546,233.4

Multiplication Properties

100

What is the Identity Property?

The Identity Property is the product of any factor and 1 is equal to the factor. 

(A number multiplied by 1 is itself.)

200

What is the commutative property?

The commutative property is the order in which factors are multiplied does not change the product. 

(It is like a conversation...the numbers flip flop.)

300

What is the associative property?

The associative property is the grouping of the factors does not change the product. 

(You can move the parentheses around and still get the same answer.)

400

How could I rewrite 5 x (200 x 3.4) to make it easier to multiply? Rewrite it and solve.

(5 x 200) x 3.4 = 1,000 x 3.4 = 3,400

500

Is the following true or false? Why?

(2.5 x 20) + 6 = 2.5 x (20 + 6)

It is false because there is multiplication AND addition. The associative property only applies if there is ONLY multiplication or ONLY addition. 

Divide Decimals

100

64.5 / 5 = 

^{*the / means divide*}

12.9

200

24.6 / 0.2 =

^{*the / means divide*}

123

300

984.5 / 0.05 = 

^{*the / means divide*}

19,690

400

98.7 / 4 =

^{*the / means divide*}

24.675

500

9.356 / 0.8 =

^{*the / means divide*}

11.695

Word Problems

100

Bear bought 5 pounds of apples. Each pound costs $5.23. How much did it cost to buy all 5 pounds of apples?

$26.15

200

Kate has 345.6 gallons of water to fill 2 fish tanks. If each fish tank is the same size, how many gallons fit in each fish tank?

172.8 gallons

300

Some people went out to lunch and the total bill for lunch was $154.88. Rob paid $24.56 of the bill. The remaining people divide the remaining amount equally and each pay $16.29 each. How many other people were at lunch?

8 people

400

The area of a rectangular mural is 243.54 feet squared. The mural is 2.4 feet wide. What is the length of the mural?

101.475 feet long

500

It costs $2.98 for one pound of turkey and $3.24 for one pound of cheese. How much will it cost to purchase 2.5 pounds of turkey and 4.5 pounds of cheese? Round to the nearest cent, if needed.

$22.03