High School How Can I Calculate Negative Multiplication Without Following Traditional Rules?

Click For Summary
The discussion revolves around calculating negative multiplication without adhering to traditional rules. A user presents a scenario of multiplying 6 pencils by negative two, concluding that 6 x -2 equals -6 based on their reasoning. However, others clarify that starting with 6 pencils means the equation should be interpreted as 6 + (-2 x 6), resulting in -6. If the initial count were zero, the outcome would be -12, emphasizing the importance of the starting value in calculations. The thread concludes with a reminder that the original post was deleted after receiving clarification, which is against forum rules.
pyroclasticsoul
Messages
2
Reaction score
0
Do NOT delete your Original Post after you have received replies and help
TL;DR
Negative times positive
Say I have 6 pencils. I want to times this by negative two. Now ignoring the rules that your teacher taught you work this out. 6 pencils negative 2 times. Negative one time would be 0 and another negative times would be -6 right? So 6 x - 2 = -6 according to simple logic. The calculator will say -12 but if I took 6 away from 6 3 times that would be -12.
 
  • Skeptical
Likes PeroK
Mathematics news on Phys.org
pyroclasticsoul said:
TL;DR Summary: Negative times positive

Say I have 6 pencils. I want to times this by negative two. Now ignoring the rules that your teacher taught you work this out. 6 pencils negative 2 times. Negative one time would be 0 and another negative times would be -6 right? So 6 x - 2 = -6 according to simple logic. The calculator will say -12 but if I took 6 away from 6 3 times that would be -12.
No. You started out with 6. "I have 6 pencils." You're describing 6 + -2x6 which equals -6.

If you had started out with zero, then the final answer would indeed be -12.
 
  • Like
Likes fresh_42
DaveC426913 said:
No. You started out with 6. "I have 6 pencils." You're describing 6 + -2x6 which equals -6.

If you had started out with zero, then the final answer would indeed be -12.
I thought about that but why do I start with 0 and not 6 since 6 is the number adjusted by -2.
 
pyroclasticsoul said:
why do I start with 0

Read the problem statement you wrote.

"I have 6 pencils"

The problem starts at +6 pencils.
 
Note -- the OP deleted their first post after getting help from Dave. This is not allowed. The OP text is restored and this thread is now closed.
 
  • Like
Likes SammyS, Bystander and topsquark
Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?

Similar threads

  • · Replies 55 ·
2
Replies
55
Views
6K
Replies
24
Views
4K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 8 ·
Replies
8
Views
4K
Replies
16
Views
2K
Replies
6
Views
2K
  • · Replies 18 ·
Replies
18
Views
4K
  • · Replies 10 ·
Replies
10
Views
2K