Free tools

Three small instruments for the parts of the TMUA that are pure skill. No account needed.

$x > 3 \;\Rightarrow\; x > 2$
Two hatched intervals on a number line: x greater than 3 sits inside x greater than 2.
Arrow lab
Build two conditions on a number line or on the whole numbers 1 to 100. The lab says which way the arrow points, draws the nesting, and gives a value that breaks any arrow that fails.
Open the arrow lab
$\tfrac34 + \tfrac56 = \tfrac{19}{12}$
Three quarters and five sixths as bars, both re-cut into twelfths: nine twelfths plus ten twelfths.
No-calculator gym
Five-minute sets of exact arithmetic: fractions, surds, indices, exact trig values, logs, estimation and standard form. Answers are typed exactly, and the slips you make are named.
Start a five-minute set
$75 \div 20 = 3.75 \text{ min}$
A 75-minute dial with a checkpoint every five questions and the last 15 minutes hatched for the return pass.
Pace planner
Checkpoints every five questions, a two-pass plan for the paper, and a quiet clock to practise with. It uses your own practice pace when this device has it.
Plan a paper

Arrow lab