Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

math > oct 4th: test #1 > Flashcards

oct 4th: test #1 Flashcards

1
Q

what is multiplication?

A

fast adding.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

how to multiply decimals?

A

deal with decimals, count the number of digits after the decimal and then move decimal in answer same number of times.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

divisibility rule for 2?

A

if the last digit is even.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

divisibility rule for 3?

A

if the sum of the # is divisible by 3.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

divisibility rule for 4?

A

if the last two # are divisible by 4.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

divisibility rule for 5?

A

if the last # are divisible by 5.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

divisibility rule for 6?

A

if the # meets the rule for 2 + 3 eg. 74, 484, 2688.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

divisibility rule for 9?

A

if the sum of the # are divisible by 9.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

divisibility rule for 8?

A

if the last 3 # are divisible by 8.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

divisibility rule for 10?

A

if the # ends in 0.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

divisibility rule for 11?

A

if the sum of every other digit = the sum of the remaining number
eg. 3856

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

divisibility rule for 12?

A

if the # follows the rules for 3 + 4. eg. 216

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

divisibility rule for 25?

A

if the last two digits are either 00, 25, 50, or, 75.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

prime number:

A

only has 1 set of factors, can only be divided by 1 and itself.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

composite number:

A

has more than 1 set of factors, can be divided by at least three numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

example of prime numbers:

A

2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.

17
Q

what makes up a power?

A

a base and an exponent.

18
Q

what is a power?

A

a numerical expression that shows repeated multiplication.

19
Q

what does the base do (power)?

A

the number being multiplied.

20
Q

what does the exponent do (power)?

A

the amount of times to multiply the base.

21
Q

how to multiply powers?

A

if the base is the same then add the exponents
eg = 4 to the power of 3 + 4 to the 5 = 4 to the power of 8.

22
Q

how to multiply powers when the base and exponents aren’t the same?

A

if the bases are different you must solve/calculate differently.

23
Q

how to divide powers?

A

if the bases are the same then subtract exponents.
eg. 7 to the power of 7 divided by 7 to the power of 4 = 7 to the power of 3.

24
Q

how to divide powers with brackets?

A

when dealing with brackets, you multiply the 2 exponents together.

25
Q

how to multiply powers when bases are different but exponents are the same?

A

multiply bases and leave the exponents.

26
Q

what is expanded form?

A

showing a number while separating each ones, tens, hundreds, thousands…
342 = expanded form - 300 + 40 + 2.

27
Q

what is scientific notation?

A

easy to express either really large or really small numbers.
342 = scientific notation - 3.42 x 10 to the power of 2.

28
Q

what are the 3 steps of scientific notation?

A
  1. decimal always goes between first and second digit.
  2. mental multiply by base 10 to move decimal. This number becomes exponent over ten.
  3. Rewrite using base 10 with exponent.
29
Q

for scientific notation: if we move the decimal ____ than we have a positive exponent

A

left.

30
Q

for scientific notation: if we move the decimal RIGHT than we have a ____ exponent.

A

negative.

31
Q

what is multiplying by power of 10?

A

when multiplying by power of ten, the decimal moves 1 spot for every power (exponent)

32
Q

how to multiply by base 10 with a decimal?

A

the decimal moves 1 spot to the left for every power of 10.
eg. 327 x 0.01 = 3.27

33
Q

what is dividing by power of 10?

A

when we divide by a whole number the answer becomes smaller which means the decimal is moving left 1 spot for every power of ten. which also happens to each exponent.

34
Q

what is dividing by power of ten with a decimal?

A

when we divided by a decimal power of ten the answer becomes larger when we move the decimal to the right.

35
Q

if you are expressing dividing by powers of 10 with a house…

A

NO DECIMAL IN HOUSE!!!

36
Q

i hate

A

lazy people

37
Q

NEVER BACK DOWN NEVER WHAT??

A

NEVER GIVE UP

math (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions