Question

formulas
1 meter = 100 centimeters
1 kilogram = 1000 grams
1 kilometer = 1000 meters
1 liter = 1000 milliliters

module 1 review
test tuesday 9/24

complete the chart below.

meters	centimeters
2
5
8
10

look at the number shown. fill in the blank to make the statement true
9,945
the value of the underlined 9 is times as many as the circled 9.

round 245,134 to the nearest thousand
round 245,134 to the nearest hundred thousand
round 245,134 to the nearest hundred

know how to read expanded form
example: (7 x 10,000) + (4 x 100) + (3 x 10) = 70,430

compare.
625,482 652,482
23,096 2,498
200,098 204,008

add.
124,973 + 431,874 =

subtract.
641,290 - 539,298 =

be able to draw a model. represent 18 is 3 times as many as 6

Explanation:

Step1: Convert meters to centimeters

Since 1 meter = 100 centimeters, for 1 meter, 1×100 = 100 centimeters; for 2 meters, 2×100 = 200 centimeters; for 5 meters, 5×100 = 500 centimeters; for 8 meters, 8×100 = 800 centimeters; for 10 meters, 10×100 = 1000 centimeters.

Step2: Analyze place - value of 9s in 9,945

The underlined 9 is in the thousands place (value 9000) and the circled 9 is in the hundreds place (value 900). 9000÷900 = 10, so the value of the underlined 9 is 10 times as many as the circled 9.

Step3: Round 245,134 to the nearest thousand

Look at the hundreds digit (1). Since 1 < 5, we keep the thousands digit as it is. So 245,134 rounded to the nearest thousand is 245,000.

Step4: Round 245,134 to the nearest hundred - thousand

Look at the ten - thousands digit (4). Since 4 < 5, we keep the hundred - thousands digit as it is. So 245,134 rounded to the nearest hundred - thousand is 200,000.

Step5: Round 245,134 to the nearest hundred

Look at the tens digit (3). Since 3 < 5, we keep the hundreds digit as it is. So 245,134 rounded to the nearest hundred is 245,100.

Step6: Comparison

625,482 < 652,482; 23,096>2,498; 200,098 < 204,008.

Step7: Addition

124,973+431,874 = 556,847.

Step8: Subtraction

641,290 - 539,298=101,992.

Answer:

Meters	Centimeters
2	200
5	500
8	800
10	1000

The value of the underlined 9 is 10 times as many as the circled 9.
245,134 rounded to the nearest thousand is 245,000.
245,134 rounded to the nearest hundred - thousand is 200,000.
245,134 rounded to the nearest hundred is 245,100.
625,482 < 652,482; 23,096>2,498; 200,098 < 204,008.
124,973 + 431,874 = 556,847.
641,290 - 539,298 = 101,992.