counting numbers

  1. math_celebrity

    The football team has jerseys numbered from 10 to 30. Everyone gets a jersey, and there are three leftover. How many people are on the football team?

    The formula for inclusive number counts from A to B is: B - A + 1 With B = 30 and A = 10, we have 30 - 10 + 1 21 We're told everyone gets a jersey and there are 3 left over. 21 - 3 = 18 people on the team
  2. math_celebrity

    somen is like conting in 9 s they start from 55 will they say 63

    somen is like conting in 9 s they start from 55 will they say 63 Next number: 55 + 9 = 64 64 > 63, so no, Somen will never say 63
  3. math_celebrity

    Three days before the day after tomorrow is Monday. What day is today?

    Three days before the day after tomorrow is Monday. What day is today? List out days of the week: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday Three days before the day after tomorrow means we start 2 days from now, and go back three days to get to Monday. Which means it's a...
  4. math_celebrity

    Olga wrote all the natural numbers from 1 to k. Including 1 and k. How many numbers did she write?

    Olga wrote all the natural numbers from 1 to k. Including 1 and k. How many numbers did she write? The formula for the number of numbers including A to B is: B - A + 1 With A = 1 and B = k, we have: k - 1 + 1 k
  5. math_celebrity

    Set C contains all counting numbers less than 20

    C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19} Notice, we do not include 20 since it said less than, and not less than or equal to.
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