Help with "missing numbers" pattern - XP Math - Forums

 XP Math - Forums Help with "missing numbers" pattern
 User Name Remember Me? Password
 Register Arcade Members List Mark Forums Read

 Thread Tools Display Modes
 08-12-2010 #1 mary1997   Join Date: Aug 2010 Posts: 1 Help with "missing numbers" pattern Find the missing numbers and explain the pattern: 1. 1,3,__, 15, 25, 75 2. 1,2,7, __, 49, 98 3. 1,2,4,5,10,20,25,__,100 4. 1,2,3,4,6,8,12,__,24,48
08-13-2010   #2
MAS1

Join Date: Dec 2008
Posts: 249

Quote:
 Originally Posted by mary1997 Find the missing numbers and explain the pattern: 1. 1,3,__, 15, 25, 75 2. 1,2,7, __, 49, 98 3. 1,2,4,5,10,20,25,__,100 4. 1,2,3,4,6,8,12,__,24,48
These are not really patterns as we normally think about them since with patterns we can keep going as long as we keep using the same rule.

These are lists of factors.

1. Factors of 75: 1, 3, 5, 15, 25, 75
2. Factors of 98: 1, 2, 7, 14, 49, 98
3. Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50 , 100
4. Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

08-27-2010   #3
jmw106462

Join Date: Feb 2010
Posts: 388

Quote:
 Originally Posted by mary1997 Find the missing numbers and explain the pattern: 1. 1,3,__, 15, 25, 75 2. 1,2,7, __, 49, 98 3. 1,2,4,5,10,20,25,__,100 4. 1,2,3,4,6,8,12,__,24,48

Factors of 75: 1, 3, 5, 15, 25, 75. Factors of 98: 1, 2, 7, 14, 49, 98
Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50 , 100
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

These are the Factors not really tha complicated but not that easy either.
__________________
Please refrain from sending me frivolous PM's

 09-22-2010 #4 meetballs     Join Date: Mar 2010 Posts: 46 agree with MAs1
11-30-2010   #5
tiger190

Join Date: Oct 2010
Posts: 8

Quote:
 Originally Posted by meetballs agree with MAs1
same here smart people in xpmath a lot of them

11-30-2010   #6
Lisasmith111

Join Date: Nov 2010
Posts: 36

Quote:
 Originally Posted by MAS1 These are not really patterns as we normally think about them since with patterns we can keep going as long as we keep using the same rule. These are lists of factors. 1. Factors of 75: 1, 3, 5, 15, 25, 75 2. Factors of 98: 1, 2, 7, 14, 49, 98 3. Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50 , 100 4. Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
I must confess, I struggled with this one. I've always found series tricky. I had to get the spreadsheet out and check what was going on. I set it out carefully so that I could see the pattern. But without the solution from Mas1 I don't think I would have thought of factors. Well done you Mas1!!!!!

Bye the way does Mas1 or anyone else have a good way to approach series in general? Ie a systematic approach for people like me who tend to get stuck / frustrated with series.

Many thanks in advance folks!

 11-30-2010 #7 bushiblade     Join Date: Dec 2009 Posts: 38 these are really good problems __________________ BushiBladeFastest Ninja ALIVE
 11-30-2010 #8 macincheese     Join Date: Nov 2010 Posts: 4 agree i no right
12-03-2010   #9
tiger190

Join Date: Oct 2010
Posts: 8
yep

Quote:
 Originally Posted by macincheese i no right
yep i agree wit u

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Welcome     XP Math News     Off-Topic Discussion Mathematics     XP Math Games Worksheets     Homework Help     Problems Library     Math Challenges

All times are GMT -4. The time now is 05:24 AM.

 Contact Us - XP Math - Forums - Archive - Privacy Statement - Top