Question

Which equations show that the set of whole numbers is closed under multiplication?

Choose all answers that are correct.

A.
–1 • –1 = 1

B.
0 • –1 = 0

C.
0 • 2 = 0

D.
2 • 1 = 2

Answer 1

I think it is A & B

Answer 2

@homeworkhelp can you help?

Answer 3

Sure, give me a moment.

Answer 4

ok

Answer 5

Real numbers
Integers
Rationals numbers
Decimals
Complex numbers
Natural numbers
Cardinals
Ordinals

This is a list of what falls under multiplication.

I'm not really sure about this question, but this list may help you.

At the same time, since this list says real numbers, whole numbers, things like that, I would assume that C and D may be the correct answer.
This one i'm not really sure on. Sorry.

Answer 6

ok what school do you go to @homeworkhelp

Answer 7

I'm currently in high school, what about you?

Answer 8

I am in 6th grade but am doing 9th grade math

Answer 9

thats m=why I need help

Answer 10

*why

Answer 11

I am going into 7th grade

Answer 12

I can help check your answers here, I think. do you guys know which numbers are the "whole numbers"?

Answer 13

aren't all of them?

Answer 14

I already finished math, :) I'm just not good at some parts of it.

Answer 15

ok thats ok

Answer 16

I mean C and D
sorry!

Answer 17

oh yeah

Answer 18

Well, no. :-)

Counting numbers are 1, 2, 3, 4, as high as you can go. But not zero, not fractions, not irrational numbers and all those other weird stuff out there.
Whole numbers include zero, so 0,1,2,3,4,...
Integers include negative numbers, so ..., -1, 0 -1-2-3,...

Answer 19

so it is c & d

Answer 20

are those the answers?

Answer 21

@mjdennis

Answer 22

When they say "closed under multiplication", it means that if you multiply one whole number by another, you still get a whole number. Such as 0*3=0, or C or D.

A group that is NOT closed under multiplication is negative numbers. -5*-3 = +15 and +15 does not belong in the negative numbers.

Whole numbers are NOT closed for division. If you try \[1\div2\] it is not a whole number!

Answer 23

so now i am really confused

Answer 24

Well, those two match the definitions. I'm not much for saying "here's the answers"

Answer 25

om so most likely it is c & d

Answer 26

*ok

Answer 27

I have 3 more questions... can u help me @mjdennis

Answer 28

Sorry, I am off OS until tomorrow. Lots of other good folks to help!