Math and Arithmetic

To determine if an estimate is an overestimate or an underestimate, compare the estimate to the actual value or a more accurate reference point. If the estimate is greater than the actual value, it's an overestimate; if it's less, then it's an underestimate. Additionally, consider the methods used for estimation—if they generally involve rounding up or using conservative assumptions, they may lean towards overestimation, while rounding down or being overly cautious may lead to underestimation.

0.6 is a decimal. As a proper fraction it is 3/5.

77,777 can be shown as 38,888+38,889 = 77,777

You can use properties such as the distributive property, associative property, and commutative property to write equivalent expressions. For example, the distributive property allows you to expand or factor expressions, like rewriting (a(b + c)) as (ab + ac). The commutative property enables you to change the order of terms, such as (a + b) becoming (b + a), while the associative property lets you regroup terms, such as ((a + b) + c) being rewritten as (a + (b + c)). By applying these properties, you can create different but equivalent forms of the same expression.

4000000000 + 500000000 + 80000000

48.0769

The only number is 13 X 1 or 1 X 13... If your trying to get an equation to equal 13 you have to add up to get to 13.

Example- 9+4x1= 13

0.005

10000 boxes to get 10000 boxes!

The simplest form of 25 over 35 is 5/7, by simply divide both number by 5.

To determine the number of 2-meter tall people in the world, we would need to consider the average height distribution of the global population. The probability of an individual being exactly 2 meters tall would be quite low, as this height is significantly above the global average. However, with the current global population estimated at around 7.9 billion, we could estimate the number of individuals around 2 meters tall to be a very small fraction of that total.

11 vertices (one more than the number of vertices in the base).

8 x 8 = 64

Divide by '10' because 10 mm = 1 cm

Hence 115 mm = 11.5 cm

0.8

Lincoln cents have never been struck in silver. They're made of copper-plated zinc. That leads to at least 3 possibilities:

> Your cent was struck on a dime blank. If it's the same size as a dime, you have what is called an "off metal error". These are valuable but you would need a professional appraisal.

> Your cent was struck on a normal zinc blank, but was never plated. If there is no trace of copper showing, it might retail for as much as $100.

> Someone dipped the coin in acid to remove the copper plating. In that case it's a damaged coin worth 1¢

In any case it would need to be authenticated by someone who specializes in error coins to rule out tampering or damage.

5

-5

6

'cm' ( centimetres) is a metric measure of length

'feet' is an Imperial measure of length.

They are two different measuring systems. !!!!

The conversion factor is

1 inch = 2.54 cm

12 inches ( 1 foot) = 12 x 2.54 = 30.48 cm

NONE!!!!

Square yards is a measure of AREA

Feet is a measure of LENGTH.

Multiply the 'feet' together to arrive at 'cubic feet'.

Then divide by '27', as there are 27 cu.ft = 1 cu.yd.,

Hence

120 ft X 40 dt x 1 ft = 480 cu.ft.

480 cu.ft. / 27 cu.ft. = 17.777... cu.yds. = 17 7/9 cu/yds

NB the .point seven' decimal recur to infinity, hence the mathematical notation of three or more dots after the last decimal.

A circle does NOT have CUBIC FEET. A circle has an AREA and a CIRCUMFERENCE.

A Sphere has CUBIC FEET. A sphere has a VOLUME, SURFACE AREA, and a CIRCUMFERENCE.

The eq'n for the volume of a sphere is

V(Sphere) = (4/3) pi r^(3)

Out of the figures quoted in your question, which is the radius(r)?

A dodecagon is a 12-sided figure.

Exterior Angle = 360 / no. of sides.

Interior Angle = 180 - Exterior Angle.

Combining

INT. Ang = 180 - ( 360/ n)

Hence

INT. ANG. = 180 - ( 360/12)

INT.ANG = 180 - 30

INT. ANG = 150 degrees.

1+8

2+7

3+6

4+5

9+0