Love For MathCreative Math Education

Challenge 1: I'm thinking of a number

I am thinking of a number. If I add 3 to the number and multiply it by 5, I get a new number.

I can also get the same new number by adding 47 to my original number.

What number am I thinking of? Also, explain how you found it.

What students worked out11

  • Student 8

    8

    • Karanteacher

      Also, Can you explain how you got this?

      • Student 8

        8+3=11
        11*5=55
        8+47

  • Student 8

    8+3=11
    11*5=55
    8+47

  • Student 8

    1

  • Student 2

    [x+3]*5=x+47
    5x+15=x+47
    4x=47-15
    =32
    x=8

  • Student 3

    choosing random number first and then going closer to the target answer number

  • Student 4

    Sir, your number is 8.

    (x*3)+5 = x+47
    5x+15 = x+47
    5x-x = 47-15
    4x = 32
    x = 8

  • Student 1

    You number is eight
    I used guess and check Strategy starting with it went like this 10+3=13 13×5=65 10+47=57 it was close then i tried with 9 it went like this 9+3=12 12×5=60 47+9=56 it was also closer than last time so I knew i was getting closer then i tried 8 8+3=11 11×5=55 8+47=55 so that is how I got my answer

  • Student 5

    8+3=11
    11*5=55
    8+47=55

  • Student 6

    8+3
    =11
    11×5
    =55
    8+47
    =55