Unit 2

Compare and round Decimals

100

round 8.7 to the nearest whole number

9

200

1.2 ________ 1.25

<

less than

300

8.269 _________ 8.268

>

greater than

400

331,428.26 ________ 331,428.2600

=

500

round 645.058 to the nearest hundreths

DOUBLE JEOPARDY

645.06

Place value

100

what digit it in the hundredths place of this number? 73.424

2

200

what is the value of the underlined digit? 43.274

4/1000 or 0.004

300

what is the place value of the underlined digit? 43.274

thousandths

400

what is the digit in tens place? 672.387

7

500

what is the value of the underlined digit? 3720643.279

3,000,000

Adding/Subtracting Decimals

100

7.34-3.21

4.13

200

0.909+4.09=

4.999

300

There are 19.3 cups of flour in a bag. The chef uses 2.9 cups for making cookies. Then, he uses 1.2 cups of sugar and 5.1 cups of flour for making banana bread. How many cups of flour are left?

DOUBLE JEOPARDY!!!!!

19.3 – 2.9 – 5.1 = 11.3

11.3 cups of flour are left

400

The chef took out 54.8 g of butter but then found out that he took out 6.9 g of butter more than he need. How much butter did he need?

47.9 g

500

The chef is making 10.5 batches of dinner rolls. For each batch, he kneaded dough for 0.7 hours and let the dough rest for 1.6 hours. Then he baked the dough for 0.4 hours. How long does it take to make each batch of dinner rolls?

0.7 + 1.6 + 0.4 = 2.7

It takes 2.7 hours to make the dinner rolls

Adding/Subtracting Fractions

100

1 1/5 + 8 3/5

9 4/5

200

5/8 of the staff are male. 5/12 of the staff works part time at the aquarium. What fraction of the staff is female? 

8/8 - 5/8 = 3/8

300

7 6/10 + 5 9/10= 

13 1/2

400

 The penguin nursery is open two times a day: 2/3 hour at noon and 5/12 hour in the afternoon. How much time is the penguin nursery open every day?

2/3 + 5/12 = 1 1/12

The penguin nursery open 1 1/12 hours

500

Josh was packing to move to another office. He packed 3 2/5 boxes on Tuesday and 2 9/10 boxes on Wednesday. After everything was moved to his new office on Wednesday afternoon, he only found 4 1/4 boxes. How many boxes were missing?

3 2/5 + 2 9/10 = 6 3/10 

6 3/10 − 4 1/4= 2 1/20

2 1/20 boxes were missing.

powers of 10

100

10 is what to the power of ten?

10¹

200

1,000 is what to the power of ten?

10³

300

5.23 times 10⁴ is what number?

52,300

400

what is 67,937.9 divided by 10 to the power of 3

67.9379

500

What is the small number on top of the power of 10 called?

exponent