Justin Bar Graph loves math challenges. He says he can solve any problem that Jack Addition gives him. Jack is determind to find a tough one and come across the following problem (involving addition naturally): "How many addition signs should be put between the digits of the number 987654321 and where should they go to get a sum of 99?" Jack thinks they should estimate and Justin wants to try the guess and check method. Can you help them solve this problem?
Monday, April 18, 2011
POW! (Problem of the Week 3) 4/18/2011
Read the following problem. Post a solution AND specific explanation of how you found your answer. The first correct post and explanation (by Friday's math class) will earn $5.00 towards your math class checkbook. Good luck!
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My answer is 9+8+7+65+4+3+2+1 so you would need 7 addition signs!
ReplyDeleteMy work:
Because if you do 98+7+6+54+3+2+1 you get 171
Also if you do 9+8+76+5+4+32+1 you get 130 so i tryed a bunch of wayes and i figured there would be paturn in the numbers so i tryed a tens number then two single nunbers then a tens number and then two single number and then i had the 1 left a i said in my head that one in a whold number and so i added them all up and got the sum of 99 and you check your work if 1) you used all the numbers they gave you and then 2) if you got the sum of 99 because one of there hints they gave you in the problem was that the sum was going to be 99!! and that is my answer!!!!!
Lindsey Length:) gess who??
Lindsey Length is quick as can be when armed with a keyboard! I wasn't joking when I told the class they'd have to act fast to post an answer before you! Excellent job with your solution. I especially like how you were looking for a pattern and then thought about how to check your answer for accuracy. Can anyone think of another strategy to solve this problem? Let's keep the discussion going!
ReplyDeleteYay thankes Mrs Colcord! all morning and night i was running up my stairs to see if you posted it yet! and what i thought was funny, was that at the exact moment i sent it i went to do the one at the top and then i looked down at the posts and mine was on! So what i think, was that we were both on at the exact time!
ReplyDeleteLindsey Length:)