Monday 14 November 2016

KS2 Maths Challenge: No 2

Your challenge is to use the numbers available (50, 75, 9, 8, 7 and 5) and the four operations (addition, subtraction, multiplication and division), to make the target number of 640.

Each card can only be used once. It may not be necessary to use all the cards.

How close to 640 can you get? 
How many different ways can you make 640?
What is the most efficient way to make 640?
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59 comments:

  1. marius 4 red10:37 am, November 17, 2016

    i had 50 i times by 9 i got 450 then i calculated to get 225 then i added 450 225 then i got675 i took away 9 5 8 then i got 651

    ReplyDelete
  2. Lita9:58 am, November 18, 2016

    Add 340 to 300 and you'll end up getting 640

    ReplyDelete
  3. Miguel 5 Red10:47 am, November 18, 2016

    75+50=125 125X5=625 625+10 = 635

    ReplyDelete
  4. timi 3 red1:44 pm, November 18, 2016

    I can get to 639 that is how much I can get to

    ReplyDelete
  5. chinemey6blue8:22 pm, November 18, 2016

    640-0=640
    640 divided by 1 =640
    100 times 4=400+200+40=640
    1,000 -500=500+140=640

    ReplyDelete
    Replies
    1. Mr Highman8:06 am, November 22, 2016

      Read the question carefully Chinemey. You can only use the following numbers: 50, 75, 9, 8, 7 and 5.

      Delete
  6. Reo 6 red4:30 pm, November 21, 2016

    50x12=600+50=650-5=645-5=640

    75x8=600+5+5+5+5+5+5+5+5=640

    8x80=640

    ReplyDelete
    Replies
    1. Mr Highman8:06 am, November 22, 2016

      You can only use each of the numbers once Reo. How did you get 12?

      Delete
    2. Reo 6 Red8:24 am, November 28, 2016

      75×9=675 8+7=15 675-50=625+15=640

      Delete
  7. Adrian class 6 red7:12 am, November 22, 2016

    320 + 320 = 640 I got 640 by halfing the number 640 which gave me 320 and adding 320 together that's how I got 640

    ReplyDelete
  8. Boston 4 red9:39 am, November 22, 2016

    530 +110= 640

    ReplyDelete
  9. Rayyan 4 Blue10:45 am, November 22, 2016

    First I do 50+75=125 then they do 9+8=17 then I do 17+7=24 now I do is I add 125+24= 149 then I do 149 time 5 I get 745 take away 50 I get 695 I do 5+5= 10 I take away 10 =685 685 take away 5= 680 then I take way 50 is 630 now I do 5+5=10 now I do 630+10=640

    ReplyDelete
  10. Ayomide O2:54 pm, November 22, 2016

    75+50=125
    125x5=625
    625+8=633
    633+7=640

    ReplyDelete
  11. Nathan6red3:05 pm, November 22, 2016

    50X9=450 9X8=72 7X5=35 450+72=522 522+35=557 557+75=632

    ReplyDelete
  12. Amarnie 6red3:06 pm, November 22, 2016

    50 x 7 + 30

    ReplyDelete
  13. Nana 6red3:08 pm, November 22, 2016

    75+50x5=625+9+7=641
    I used the biggest numbers first then I x it to make 645 later I added 9 and 8 which was 642 but I took away the 8 and added 7 instead to make the closest number to 640

    ReplyDelete
  14. Javan6red3:09 pm, November 22, 2016

    70x9=630+8=638+5=643

    ReplyDelete
  15. Lara 6Red5:33 pm, November 22, 2016

    First try 9x8x7+75+50=629

    Second try 75x9=675-50=625+15=640
    8+7=15


    ReplyDelete
  16. Selisa 6 Red6:00 pm, November 22, 2016

    540+100=640
    641-640
    640 divide 1=640
    740-100=640
    100x4=400+200+4

    ReplyDelete
  17. Rdeah 6 red6:15 pm, November 22, 2016

    75x8+50-9=641

    ReplyDelete
  18. Reo 6 red6:18 pm, November 22, 2016

    75+50=125
    125x5=625
    8+7=15
    625+15=640

    ReplyDelete
    Replies
    1. Mr Highman9:12 pm, November 22, 2016

      Well done Reo! Are there any other ways of making 640?

      Delete
  19. Alejandra 6Red6:28 pm, November 22, 2016

    75+50=125
    125×5=625
    625+8=633
    633+7=640

    ReplyDelete
  20. Ayomide O6:37 pm, November 22, 2016

    75+25=125
    125×5=625
    625+8=633
    633+7=640

    ReplyDelete
  21. Amisha 6red10:03 pm, November 22, 2016

    The closest I got was v
    641

    75x8=600+50=650-9=641

    ReplyDelete
  22. Adeline 6 red7:22 am, November 23, 2016

    75 + 25 = 125
    125×5=625
    625+8=633
    633+7=640

    ReplyDelete
  23. Gavin 6 Red8:37 am, November 23, 2016

    75×9=675 675-5×7=640

    ReplyDelete
  24. Kermarley9:39 am, November 23, 2016

    We could try 300+300=600 now I am going to ad 40 to 600 600+40 will give you 640

    ReplyDelete
  25. Kermarley9:42 am, November 23, 2016

    Let's do 650-10 will give you 640.

    ReplyDelete
  26. Taio 4 Blue10:01 am, November 23, 2016

    You could do 200+300=500 then 500+40=540 and I am going to add 540 to 100 540+100= 640

    ReplyDelete
  27. Ayomide O11:26 am, November 23, 2016

    75+50=125
    125x5=625
    625+8=633
    633+7=640

    ReplyDelete
  28. SIHAM6RED11:35 am, November 23, 2016

    125x2.5+2.5+625+4+4+633+7=640

    ReplyDelete
  29. Selisa 6 Red4:13 pm, November 23, 2016

    75x9=675
    675-8=666
    666-5=661
    Can you get closer?

    ReplyDelete
  30. Elizabeth 6blue4:16 pm, November 23, 2016

    50x9=450
    450+75=525
    9x8=72
    525+72=597
    7x5=35
    597+35=632
    That was the closest I got to but I'm going to keep on trying until I get to the answer!!

    ReplyDelete
  31. Selisa 6 Red4:17 pm, November 23, 2016

    75x9=675
    675-7=668
    668-8=660

    ReplyDelete
  32. Amarnie6:41 pm, November 23, 2016

    50+75=125
    125x5=625
    625+9=634
    634+8=642
    642+7=649

    ReplyDelete
  33. Amarnie6:49 pm, November 23, 2016

    75x8=600
    600+50=650
    650-9=641

    ReplyDelete
  34. Amarnie 6red7:09 pm, November 23, 2016

    50+75=125
    125x5=634
    634+7=641
    641+8=649
    649-9=640

    ReplyDelete
  35. Ruqayya 6Red7:26 pm, November 23, 2016

    I got 640. I calculated 50+75=125×5=625+7=632+8=640

    ReplyDelete
  36. Amarnie 6red7:47 pm, November 23, 2016

    75+50=125
    125x5=625
    625+8=633
    633+7=640

    ReplyDelete
  37. Amarnie 6red8:05 pm, November 23, 2016

    75x9=675
    675-50=625
    625+7=632
    632+8=640

    ReplyDelete
  38. Lopez8:27 pm, November 23, 2016

    100+25=125
    125 times 5=625
    625+15=640

    ReplyDelete
  39. Jason 4red11:53 am, November 24, 2016

    75x9=675
    675-50=620
    8+7+5=20
    620+20=640

    ReplyDelete
  40. Jason 4red12:00 pm, November 24, 2016

    1280 divided by2=640
    5x128=640
    6x100=600+40=640

    ReplyDelete
  41. Radeah 6 red7:29 pm, November 24, 2016

    50x8=400 9+400=409 8-409=401

    ReplyDelete
  42. Amarnie 6red7:36 pm, November 24, 2016

    75x8=600
    600+50=650
    650-9=641
    That is the closest I can get to 640 but I have made other different ways of making the number with only using these numbers 50,75,9,8,7,5.

    ReplyDelete
  43. Adeline 6 red6:52 pm, November 26, 2016

    75+25=125
    125×5=625
    625+8=633
    633+7=640

    ReplyDelete
  44. Radeah 6 red10:26 pm, November 27, 2016

    75x8=600
    600+50=650
    650-9=640

    ReplyDelete
  45. Matthew 4Red2:09 pm, December 05, 2016

    600+40=640 Is An Ovias One 650-10=640 6x100=600+40=640 600+70=670-30=640 900-300=600+40=640 Well That's All I Have So Far.

    ReplyDelete
  46. Jenniel 6red11:36 am, December 07, 2016

    75x9=675
    7x5=35
    675-35=640

    ReplyDelete
  47. Jenniel 6red12:19 pm, December 07, 2016

    75+50=125
    125x5=625
    8+7=15
    625+15=640

    ReplyDelete
  48. Alex 6 blue2:55 pm, January 09, 2017

    75+50=125
    125x5=625
    8+7=15
    625+15=640 or 75x9=675
    7x5=35 675-35=640

    ReplyDelete
  49. Esther 6blue2:59 pm, January 09, 2017

    31+33=64 5+5=10 64x10=640

    ReplyDelete

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