Groups

    Maths Fun

    I am quite clever at Maths this but this is really bugging me, I saw this on another forum

    Make 69 using the following numbers: 7 8 8 9 9

    You can only use each number once and can only add, subtract, multiply and divide

    Good Luck all I am gazzumped

    18 Comments

    9 x 8 = 71
    9 - 7 = 2
    subtract the 2
    =69

    9*8 thought was 72

    Original Poster

    You need to use every number, I should have put that in at the start. Sorry

    Lockstockdude;4163872

    9 x 8 = 719 - 7 = 2subtract the 2=69



    9x8 is 72....71 is prime

    John

    haha figured afterwards school boy error

    pretty sure 9 x 8 is 72.............................

    Original Poster

    I can get to 68 and 70 but I feel it is impossible but hey I may be proven wrong. Been trying to do it since yesterday just cannot get it out my head, am funny with that sort of thing

    I can get 69.875 lol

    Is it cheating to do 78 - 8 - (9/9) = 69?
    Do I have to use each digit as an individual number?

    Why did it have to be 69?

    9x8=72
    square root 9=3
    72-3=69
    8 - 7 = 1, 69 x 1 = 69

    Old Bear;4164083

    Is it cheating to do 78 - 8 - (9/9) = 69? Do I have to use each digit as … Is it cheating to do 78 - 8 - (9/9) = 69? Do I have to use each digit as an individual number?



    Yes that's cheating lol, what would Vorderman say!

    Original Poster

    I haven't got a clue why it is 69 and like I said you can ony use each number once and all numbers have to be used. You can ADD, SUBTRACT, MULTIPLY & DIVIDE. Just think of countdown lol

    Such as

    68 is 8 X 9 = 72, 7 - 9 = 2 / 8 = 4, 72 - 4 = 68
    70 is 8 X 9 = 72, 9 - 7 = 2, 72 - 2 = 70

    andymack;4163902

    pretty sure 9 x 8 is 72.............................


    haha... pretty sure 9 x 8 is 71 :thumbsup:

    Banned

    strike;4164124

    9x8=72square root 9=372-9=698 - 7 = 1, 69 x 1 = 69



    Thought that myself but would it count since

    You can only use each number once and can only add, subtract, multiply and divide

    I tihnk someone's having you on mate.

    Original Poster

    I agree but I thought I would try on here to see if there was any unknown mathematic genius that could solve it, I will keep trying though unless it is proven impossible cause it is really ticking me off now

    7+8+8 = 23

    Turn one 9 upside down to make it a 6

    9-6 = 3

    Multiply the totals of the above two sums 23 x 3 = 69

    NV
    Post a comment
    Avatar
    @
      Text
      Top Discussions
      1. What do these 2 men have in common1014
      2. Just heard this...2 ★★★★★★★★★★★★★★ congrats to all on 392k ★★★★★★★★★★★★★★7764216
      3. How dangerous is Donald trump?31138
      4. ❅☁☁❅ I want☼to talk☼about the☔WEATHER☔no politics☃no religion❅☁☁❅18846168

      See more discussions