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Students are given a decimal in the form 0.X and asked to identify its value, either X units, X tenths, X hundredths or X tens.

Students are asked how many milliseconds in one second  OR  how many milligrams in one gram  OR  how many millimetres in one metre.

Students have to match four receptacles of varying sizes with the following fractions of a litre: 1 whole, 1/10, 1/100 and 1/1000.

Students must match the decimals 0.1, 0.01 and 0.001 to their fraction equivalents. The order in which they appear is randomised but it is always the same three decimals.

Students are shown a receptacle and told that it holds either one tenth, one hundredth or one thousandth of a litre. They are asked how many of them would be needed to hold one litre.

Students are shown one of four containers and asked to convert either one tenth, one hundredth or one thousandth of a litre to millilitres.

This question ensures that students understand that the fraction line means divide. There are 3 versions of the question, for denominators 10, 100 and 1000.

Calculate CTR given number of clicks and number of impressions served.

percentage CTR is 0.5, 1, 1.5 or 2%. Number of impressions is randomised.

Given a budget and the number of views, calculate the cost per view. All numbers are randomised.

clicks = budget/CPC

All numbers are randomised.