Decimals

  • Decimal Time
    problem

    Decimal time

    Age
    11 to 14
    Challenge level
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    Use the clocks to investigate French decimal time in this problem. Can you see how this time system worked?
  • Recurring Mean
    problem

    Recurring mean

    Age
    14 to 16
    Challenge level
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    What is the mean of 1.2 recurring and 2.1 recurring?
  • Reductant ratios
    problem

    Reductant ratios

    Age
    16 to 18
    Challenge level
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    What does the empirical formula of this mixture of iron oxides tell you about its consituents?
  • Round the Dice Decimals 2
    problem

    Round the dice decimals 2

    Age
    7 to 11
    Challenge level
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    What happens when you round these numbers to the nearest whole number?

  • Round the Dice Decimals 1
    problem

    Round the dice decimals 1

    Age
    7 to 11
    Challenge level
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    Use two dice to generate two numbers with one decimal place. What happens when you round these numbers to the nearest whole number?

  • Forgot the Numbers
    problem

    Forgot the numbers

    Age
    7 to 11
    Challenge level
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    On my calculator I divided one whole number by another whole number and got the answer 3.125. If the numbers are both under 50, what are they?

  • Magic Matrix
    problem

    Magic matrix

    Age
    7 to 11
    Challenge level
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    Find out why these matrices are magic. Can you work out how they were made? Can you make your own Magic Matrix?
  • Route Product
    problem

    Route product

    Age
    7 to 11
    Challenge level
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    Find the product of the numbers on the routes from A to B. Which route has the smallest product? Which the largest?

  • problem

    Doughnut percents

    Age
    7 to 14
    Challenge level
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    Can you make doughnuts by matching these fractions, decimals and percentages?