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Math Khan Academy > 4rd Grade > Flashcards

4rd Grade Flashcards

1
Q

What is an equivalent fraction

A

Fractions are equivalent if they are equal or represent the same amout 1/2 == 4/8

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2
Q

What is the purpose of having a common denominator on fractions?

A

Having common denominators makes things like comparing, adding, and substracting fractions easier

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3
Q

How can we found a common denominator for 2 or more fractions?

A

We need to list the multiples of each denominator until we find the smallest multiple they have in common

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4
Q

How can we compare fractions?

A

We can compare fractions by seeing which one takes up a greater portion of the same whole

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5
Q

What is an improper fraction?

A

Is a fraction where the numerator is greater than or eaqul to the denominator

9/4, 5/3, 10/2

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6
Q

What is a mixed number(numero mixto)?

A

It´s a numberconsisting of a whole number and a proper fraction

4 1/2

1 3/8

12 5/6

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7
Q

How can we re-weite a mixed number as an improper fraction?

3 4/5

A
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8
Q

How can we re-write an improper fraction as a mixed number?

10/3

A
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9
Q

How can we write a decimal as a fraction?

A

We write the decimal number as a numerator and we write its place value as the denominator

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10
Q

In a decimal number, what happens if we have a number to the left of the decimal point?

A

We keep that number as a whole number

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11
Q

re-write 0.07 and 2.1 as a fraction

A
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12
Q

Resolver estas fracciones a decimales

1/2

1/4

1/5

A

1/2 = 0.5

1/4 = 0.25

1/5 = 0.2

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13
Q

What measure Volume?

A

Volume measure capacity

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14
Q

What is the most common units of volume are?

A

millimiters and liters

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15
Q

1 liter into milliliters?

A

1 liter = 1000 milliliters

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16
Q

8 liters = ? milliliters

A

8 liters = 8.000 milliliters

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17
Q

45 ml = ? L

A

45 ml = 45/1000 = 0.045 ml

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18
Q

What is distance?

A

espacio considerado desde una perspectiva lineal, entre una persona o cosa y otra

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19
Q

Name the most common unites of distance?

A

millimeters, centimeters, meters and kilometers

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20
Q

1 centimeter = ? millimiters

1 meter = ? centimeters

1 meter = ? millimeters

1 kilometer = ? meter

A

1 centimeter = 10 millimeters

1 meter = 100 centimeters

1 meter = 1000 millimeters

1 kilometer = 1000 meters

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21
Q

1 foot = ? inches

1 yard = ? feet

1 yard = ? inches

1 mile = ? yards

A

1 foot = 12 inches

1 yard = 3 feet

1 yard = 36 inches

1 mile = 1760 yards

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22
Q

What is a line?

A

a line extends forever in both directions

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23
Q

What is a line segment

A

is just part of a line, it has two endpoints

24
Q

what is a ray?

A

a ray starts at one poing and continues on forever in one direction

25
Q

what is a perpendicular line?

A

are lines that meet at right angles

26
Q

what is a parallel line

A

lines that are always the same distance apart from each other, they will never meet

27
Q

What is an angle?

A

is a two rays that share a vertex

28
Q

What is a vertex?

A

typically means a corner or a point where lines meet, the plural is vertices

29
Q

What is an acute angle in degrees

A

between 0º and 90º

30
Q

What is a right angle in degrees

A

exactly 90º

31
Q

What is a obtuse angle in degrees

A

between 90º and º80 º

32
Q

What is a straight angle in degrees

A

exactly 180º

33
Q

What is a line of symmetry?

A

is a line where we can fold the image and have both halves match exactly

34
Q

When shapes are symmetrical figures?

A

if they have at least one line of symmetry on them

35
Q

What is an acute(agudo) triangle

A

An acute triangle has 3 angles that each measure less than 90º

36
Q

What is a right(recto) triangle

A

it has 1 angle that measures 90º and 2 acute angles

37
Q

What is an obtuse triangle

A

it has one angle that measures more than 90º and 2 acute angles

38
Q

What is a equilateral triangle?

A

it has 3 equal sides

39
Q

What is an isosceles triangle?

A

it has at least two equal sides

40
Q

What is a scalene triangle?

A

it has NO equal sides

41
Q

Resume all these quadrilaterals?

quadrilateral

parallelogram

trapezoid

rectangle

rhombus

square

A
42
Q

What are factors?

A

factors are whole numbers that can evenly divide another number

43
Q

Name a purpose of a factor number?

A

It gives us a way to break down a number into smaller pieces

44
Q

What is a factor pair?

A

are two numbers that we multiply together to get a certain product.

To get the product of 8, we can multiply 1 x 8, and 2 x 4.

So the factor pairs for 8 are 1 and 8 and 2 and 4

45
Q

Which number is a factor of all numbers?

A

1

46
Q

What are multiples numbers?

A

Un múltiplo de un número es el que lo contiene un número entero de veces. En otras palabras, un múltiplo es un número tal que, dividido por a, da por resultado un número entero (el resto de la división euclídea es cero).

are numbers that result when we multiply one whole number by another whole number.

the first four multiples of 3 are: 3, 6, 9, and 12

3 x 1 = 3

3 x 2 = 6

3 x 3 = 9

3 x 4 = 12

some other multiples of 3 are 15, 30, 300

3 x 5 = 15

3 x 10 = 30

3 x 100 = 300

47
Q

How can we identifyin multiples?

A

we can check to see if a number is a multiple of another number by seeing if it can be divided evenly by the number

15 is a multiple of 3 because 15 % 3 = 5

17 is not a multiple of 3 because 17 % 3 = 5 R 2

48
Q

How do factors and mutiples relate?

why 4 and 7 are factors of 28?

A

4 and 7 are both factors of 28 because they both divide evenly into 28

49
Q

We can divide almost all numbers into…?

A

two categories:

prime numbers (números primos)

and composite numbers (numeros compuestos)

50
Q

What is a prime number?

A

numbers with exactly 2 factors

the only factors are 1 and the number itself

51
Q

what is a composite number?

A

numbers that have more than 2 factors.

It has factors in addition to 1 and the number itself

52
Q

1 foot = ? inches

A

1 foot = 12 inches

53
Q

1 yard = ? feet

A

1 yard = 3 feet

54
Q

1 yard = ? inches

A

1 yard = 36 inches

55
Q

1 mile = ? yards

A

1 mile = 1760 yards

56
Q

1 pound = ? ounces

A

1 pound = 16 ounces

Math Khan Academy (3 decks)

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