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Welcome To. Measures of Central Tendency. One Step Equations. Estimating and Rounding. Heuristics. Metric System. $100. $100. $100. $100. $100. $200. $200. $200. $200. $200. $300. $300. $300. $300. $300. $400. $400. $400. $400. $400. $500. $500. $500. $500. $500.

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Measures of Central Tendency

One Step Equations

Estimating and Rounding

Heuristics

Metric System

$100

$100

$100

$100

$100

$200

$200

$200

$200

$200

$300

$300

$300

$300

$300

$400

$400

$400

$400

$400

$500

$500

$500

$500

$500

estimating and rounding for 100
Estimating and Rounding for $100

Round to the tenths place:

71.349

answer
Answer

71.349 => Tenths place

71.349 => The four rounds down

71.3

Back

estimating and rounding for 200
Estimating and Rounding for $200

Estimate by rounding to the ones place:

11.49 – 5.15

answer6
Answer

11.49 – 5.15 => 11 – 5 = 6

Back

estimating and rounding for 300
Estimating and Rounding for $300

Estimate using front end estimation:

9.327 + 5.72 + 4.132 = ?

answer8
Answer

9.327 + 5.72 + 4.132 = ?

9.327

5.72

+ 4.132

18 1.1 18 + 1.1 = 19.1

Back

estimating and rounding for 400
Estimating and Rounding for $400

Estimate using clustering:

21.2 + 20.7 + 22.1 + 20.3 + 21.1

answer10
Answer

21.2 + 20.7 + 22.1 + 20.3 + 21.1

Each one is close to 21 so,

21 * 5 = 105

Back

estimating and rounding for 500
Estimating and Rounding for $500

Estimate 40.364 / 7.811 using compatible numbers

answer12
Answer
  • 40.364 / 7.811
  • 40 / 8 because these are compatible numbers (they divide evenly)
  • 40/8 = 5

Back

measures of central tendency for 100
Measures of Central Tendencyfor $100

Find the range:

9, 23, 5, 57, 9, 3

answer14
Answer

Range is

largest # - smallest #,

So 57 – 3 = 54

Back

measures of central tendency for 200
Measures of Central Tendencyfor $200

Find the mode:

Cam, tao, dau, cam, dau, xoai, xoai, thom, tao, cam, xoai, chom chom

answer16
Answer

There are 2 modes:

Cam and xoai each occur three times

Back

measures of central tendency for 300
Measures of Central Tendencyfor $300

Find the median:

10, 23, 17, 20, 21, 5, 14, 10

answer18
Answer

10, 23, 17, 20, 21, 5, 14, 10

Re-order the numbers from least to greatest:

5, 10, 10, 14, 17, 20, 21, 23

There are 2 middle numbers: 14 and 17. The mean of these 2 numbers is 31/2 = 15.5

Back

measures of central tendency for 400
Measures of Central Tendencyfor $400

Which measure of central tendency best describes the following situation?

Height of buildings in district 1

answer20
Answer

Median

Back

measures of central tendency for 500
Measures of Central Tendencyfor $500

Find the mean and the outlier(s) (if any). Describe how the outlier(s) effect the mean:

120, 97, 113, 110, 24, 107

answer22
Answer

120, 97, 113, 110, 24, 107

Mean:

(119+97+113+110+24+107)/6 = 95

Outlier: 24 => it is much smaller than the rest of the numbers

Mean Without Outlier:

(119+97+113+110+107)/5 = 109.2

The outlier decreases the mean by 14.2

Back

one step equations for 100
One Step Equations for $100

Find the perimeter of a rectangle if the length is 8cm and the width is 3cm

answer24
Answer

Perimeter of a rectangle = 2(l+w)

Length = 8cm; Width = 3cm

P = 2(l+w) = 2(8cm+3cm) = 2(11cm)

= 22cm

Back

one step equations 200
One Step Equations $200

Solve for x:

-5.2 + x = 7.1

answer26
Answer

-5.2 + x = 7.1

-5.2 + 5.2 + x = 7.1 + 5.2

x = 12.3

Back

one step equations for 300
One Step Equations for $300

The formula for the surface area of a sphere is SA = 4(pi)r2

If the radius is 2m, what is the surface area?

answer28
Answer

SA = 4(pi)r2

r = 2m

SA = 4(3.14)*22 = 4*3.14*4

= 16 * 3.14 = 50.24m2

Back

one step equations for 400
One Step Equations for $400

Solve for x:

x/(-5) = 8

answer30
Answer

x/(-5) = 8

x/(-5) * (-5) = 8 * (-5)

X = -40

Back

one step equations for 500
One Step Equations for$500

Write and solve an equation for the following situation:

Madison bought 12 mangos and spent 93,000 Dong. How much did she spend on each mango?

answer32
Answer

Let x equal the price of each mango. Then, 12x = 93,000D

So, x = 7750D

Back

the metric system for 100
The Metric Systemfor $100

10 grams = 1 ______

answer34
Answer

10 grams = 1 dekagram

Back

the metric system for 200
The Metric Systemfor $200

27.92 milliliters = ____ liters

the metric system for 300
The Metric Systemfor $300

2.84 hectometers = ____ millimeters

answer38
Answer

2.84 hectometers = 284,000 millimeters

Back

the metric system for 400
The Metric Systemfor $400

What is the appropriate unit of measure to estimate the capacity of a sink?

answer40
Answer

Liters

Back

the metric system for 500
The Metric Systemfor $500

Estimate the height of the classroom using appropriate units. (must be close)

answer42
Answer

Actual Height: 2.79 meters

Back

heuristics for 100
Heuristicsfor $100

Chloe stacks some blocks as shown. If she continues the pattern to 10 rows, what is the total number of blocks she will use in the 10th figure? The figure below is the 5th figure in the pattern.

answer44
Answer

First row is 1 block, 2nd is 2 blocks, 3rd is 3 blocks and so on. So, 10 rows would be 10+9+8+7+6+5+4+3+2+1 = 55 blocks

Back

heuristics for 200
Heuristicsfor $200

Beginning at 6:50 A.M., planes leave an airport for New York every 45 minutes. You arrive at the airport at 10:15 A.M. How long will you have to wait for the next plane to New York?

answer46
Answer

6:50 + 45 = 7:35 + 45 =

8:20 + 45 = 9:05 + 45 =

9:50 + 45 = 10:35

10:35 – 10:15 = 20 minutes

Back

heuristics for 300
Heuristicsfor $300

The houses on your street are numbered with odd numbers starting with 1 and ending with 201. How many house numbers contain at least one 7?

answer48
Answer

From 1 – 100, the odd numbers with at least one 7 are:

7, 17, 27, 37, 47, 57, 67, 71, 73, 75, 77, 79, 87, 97

There are 14 numbers. So in 200 there would be 14*2 = 28 numbers

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heuristics for 400
Heuristicsfor $400

A dime is 1.25 mm thick. How many meters high would a stack of dimes worth $50 be?

answer50
Answer

There are 10 dimes in a dollar, so

$50 * 10 dimes/dollar = 500 dimes

500 dimes * 1.25mm/dime = 625mm

1000mm = 1 m so,

625/1000 = 0.625m

Back

heuristics for 500
Heuristicsfor $500

A school band has a brass section of trumpet, trombone, and tuba players. There are twice as many trombones as tubas, and half as many trombones as trumpets. If there are two tubas in the band, what is the total number of players in the brass section?

answer52
Answer

Let x be the number of tubas, then

x = 2

Number of trombones = 2x = 4

Number of trumpets = 2*2x = 4x =8

2+4+8 = 14 total players

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