Math is easy!

Math is easy! is a matching exercise for sums. Each screen sets out a column of expressions on the left in red and a column of answers on the right in green, and you link every expression to the value it equals.

The range of operations goes past the basics. Alongside addition, subtraction, multiplication and division, the developer lists fractions, roots and degrees, and the instructions explain the notation used: log X Y stands for the logarithm of Y to base X, and sqrt marks a square root. Difficulty starts with simple examples and moves on towards more complex calculations.

Once every block on screen has a partner, you check your pairings. Scores can be compared with other players on a global high score table. The frame is a tall portrait one, and the instructions allow either a cursor or a finger for making the links.

Look at the red expressions in the left column and the green answers in the right. Press an expression, then press the answer it equals, using the mouse cursor or your finger, to join them as a pair. Carry on until every block on the screen has been paired, then test yourself to see whether the matches are right.

Start with the expressions you can solve at a glance; each pair you make leaves fewer answers to choose from for the harder ones. If a logarithm appears, read log X Y as the power you raise X to in order to get Y. The test comes after every block is paired, so review your links before you run it.

An arithmetic matching puzzle in a tall portrait frame. Operations listed include the basic four plus fractions, roots, degrees and logarithms, with difficulty rising from simple examples. Input is by cursor or finger, and there is a global high score table.

Crossmath Challenge has you complete equations across and down a crossword-style grid. Multiplication Master sticks to times tables from x2 to x12 but offers six different modes.